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Snixy Kitchen

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Gluten-Free Chocolate Sheet Cake with Chocolate Buttercream

May 13, 2019 by Sarah Menanix

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Last updated on June 23rd, 2019

Gluten-Free Chocolate Sheet Cake with Chocolate Buttercream

The BEST gluten-free chocolate cake recipe, bar none. With a thick swirl of chocolate buttercream and festive sprinkles, this is the perfect gluten-free chocolate birthday cake.

Gluten-Free Chocolate Sheet Cake with Chocolate Buttercream

Gluten-Free Chocolate Sheet Cake with Chocolate ButtercreamWe’re very mindful about letting Zoella (age 3) eat chocolate. We held off as long as we could and when I first gave her a taste, I thought she’d find it too bitter like I did as a kid, but that’s not the case. I even offered her a tiny piece of 90% extremely dark chocolate, but even that didn’t deter her. Now, she’s a chocolate bloodhound. If ever I sneak a bite of chocolate, she knows. 

Her: *sniff sniff* “I smell something.”

Me: “I just ate some _____(insert blatant lie).”

Her: “I smell chocolate.”

(Damn it). Now I know why my friend Emily texts me from the pantry floor where she hides from her kid to eat candy bars.

For her third birthday, she requested a “chocolate and vanilla cake with rainbow frosting” every day for a month. That’s exactly what I made as a four-layer cake, but when all 42 guests confirmed yes for her birthday party, I panicked and also made this gluten-free chocolate sheet cake at the 11th hour. 

I started with my favorite gluten-free chocolate layer cake recipe as a base. Except I hadn’t tested it as a sheet cake, so it came out too thin with not enough batter for the size of the pan. I panicked again and made another sheet pan of cake, stacking them together with a generous layer of chocolate buttercream between. I now had enough cake to feed an army. 

Best Gluten-Free Chocolate Cake

Chocolate Buttercream with Sprinkles

Best Gluten-Free Chocolate Cake with Chocolate Buttercream

Gluten-Free Birthday Cake Recipe

The best gluten-free chocolate cake

This gluten-free chocolate cake is so good that even with 2-3 servings per guest (including toddlers and newborns) almost all of it was gone by evening and we polished off the rest for breakfast.

I’ve shared the base of this cake before as a gluten-free chocolate layer cake and gluten-free chocolate cupcakes, but I don’t want you to make the same mistake I did when I first converted it to a 9×13 sheet cake. So I’ve adapted it accordingly. 

With a thick swirl of chocolate buttercream and plenty of festive sprinkles, this version is the perfect gluten-free chocolate birthday cake. No fussing with layers, crumb coats, or piping frosting. Just dump it in the pan, bake it, cool, then slather it in frosting.

Don’t forget to lick the spatula.

This cake is the best gluten-free chocolate cake recipe, bar none. I’d go so far as to call it the best chocolate cake ever as well. I’ve made it over 200 times, for every occasion: birthdays, baby showers, Valentines’ Day, Father’s day, dinner parties, I-just-need-cake days (you celebrate that too?). And every time, people ask for the recipe and no one suspects it’s gluten-free.

If you’re new to baking gluten-free and want a fool proof recipe that will blow people away, start with this cake, in any form. 

Gluten-free buttercream frosting

I’ve topped this cake with a creamy chocolate buttercream frosting that accentuates the classic chocolate cake flavor. A bit of milk or heavy cream keeps the frosting soft and smooth – perfect for spatula swirls. 

I always add a bit of chocolate extract to my chocolate desserts to boost the flavor, but if you don’t have any, just sub in more vanilla extract. 

Gluten-Free Buttercream Frosting

Gluten-Free Chocolate Cake Recipe

Moist Gluten-Free Chocolate Cake with Chocolate Buttercream

Gluten-Free Sheet Cake

Chocolate Buttercream with Sprinkles

How to make moist gluten-free chocolate cake

The great thing about this chocolate cake is that it doesn’t dry out quickly. With oil as the fat, this cake is light and fluffy with a moist chewy crumb. Even in the oven, it’s incredibly forgiving. When testing it with a toothpick, err on the side of just a little bit longer. To this day, have never accidentally over-baked it.

It’ll last for several days sealed in an airtight container – even with the frosting. Or, if you’re planning ahead, you can store the cake right in the sheet pan with a layer of plastic wrap or bee’s wrap overnight and frost the cake just in time for your party. 

To save you the trouble, here’s how you’d convert this gluten-free chocolate sheet cake into a layer cake or cupcakes. The same exact batter quantity below makes:

  • 1 9×13 cake – bake for 45-55 minutes
  • 3 8-inch layer cakes – bake for 33-37 minutes
  • 36 cupcakes – bake for 18-22 minutes

Whatever form you prefer, this will become your go-to chocolate cake recipe!

More Gluten-Free Cake Recipes

  • Gluten-Free Lemon Cupcakes
  • Gluten-Free Vanilla Raspberry Cake
  • Chestnut Plum Upside-Down Cake
  • Spiced Banana Date Cake
Continue to Content
Gluten-Free Chocolate Sheet Cake with Chocolate Buttercream

Gluten-Free Chocolate Sheet Cake with Chocolate Buttercream

Yield: 1 9x13 sheet cake, 24 servings
Prep Time: 20 minutes
Cook Time: 50 minutes
Total Time: 1 hour 10 minutes

The BEST gluten-free chocolate cake recipe, bar none. With a thick swirl of chocolate buttercream and festive sprinkles, this is the perfect gluten-free chocolate birthday cake.

Ingredients

Gluten-Free Chocolate Sheet Cake

  • Scant 1 cup milk (1 cup minus 1 tablespoon or equivalent in buttermilk and skip the vinegar)
  • 1 tablespoon white vinegar
  • 1 cup (168g) sweet rice flour (such as Mochiko - different from "white rice flour" or "brown rice flour")
  • ¾ cup + 2½ tablespoons (99g) gluten-free oat flour
  • ½ cup + 1 tablespoons (84g) millet flour
  • 1 cup + 3 tablespoons (128g) unsweetened dutch-processed cocoa powder, sifted (I use Rodelle Organic Cocoa)
  • 2¼ cups + 3 tablespoons (503g) granulated sugar
  • 2¼ teaspoons baking powder
  • ¾ teaspoons baking soda
  • 1½ teaspoon kosher salt
  • 3 large eggs, room temperature
  • 4½ tablespoons safflower oil (or other neutral vegetable oil)
  • 1½ teaspoon pure vanilla extract (I use Rodelle)
  • ¾ teaspoon chocolate extract (or ¾ teaspoon more vanilla extract) (I use Rodelle)
  • 1 cup hot water

Chocolate Buttercream

  • 1½ cups (12oz) unsalted butter, just about room temperature (60-70 degrees)
  • 4½ cups (563g) powdered sugar
  • ¾ cup (85g) unsweetened dutch-processed cocoa powder, sifted (I use Rodelle Organic Cocoa)
  • ½ teaspoon kosher salt
  • 2½ teaspoons vanilla extract
  • ¾ teaspoon chocolate extract (or ¾ teaspoon more vanilla extract) (I use Rodelle)
  • 3-4 tablespoons whole milk or heavy cream
  • Optional: Festive sprinkles

Instructions

  1. Preheat the oven to 350°F. Prepare a 9x13 cake pan by lightly oiling it, and lining it with parchment paper.
  2. If not using buttermilk, combine the milk and vinegar in a small cup and let sit while you measure the flour, at least 5 minutes.
  3. In a large bowl, sift together the sweet rice flour, oat flour, millet flour, cocoa powder, sugar, baking powder, baking soda, and salt.
  4. In the measuring cup, whisk the milk and vinegar mixture with the egg, oil, vanilla extract, and chocolate extract until smooth. Pour this mixture into the dry ingredients and stir lightly. Pour the hot water into the dry ingredients and mix until completely smooth, scraping up the sides and bottom to completely incorporate.
  5. Pour the batter into the prepared cake pan and bake for about 45-55 minutes, or until a toothpick inserted in the center comes out clean or with just a few moist crumbs and the center bounces back when poked. In my experience, it's best to err on the side of an extra minute or two to be sure - this cake is very moist and won't over-bake very easily.
  6. Let cool in the pan for 10 minutes, then overturn the cake onto a wire rack to cool completely. To do this, I place a large sheet pan over the baking pan and, holding it together, carefully flip the cake to release. Peel off the parchment paper, then place a wire rack over the top, and carefully flip right side up.
  7. While the cake cools completely, prepare the frosting. In the bowl of a stand mixer fitted with the paddle attachment, cream the butter over medium speed.
  8. Sift together the powdered sugar, cocoa powder, and salt. Slowly add this to the butter, in 4 batches, beating until incorporated. Add the vanilla and chocolate extracts and mix until smooth. Add the milk or cream, starting with just 2 tablespoons and adding additional milk or cream as needed, until frosting is smooth and spreadable. It should be somewhat glossy, but still hold swirls.
  9. When the cake has cooled, swirl the buttercream over the top of the cake (I recommend using the back of a soup spoon) and top with colorful sprinkles, if desired. Slice into 24 pieces and devour.
© Sarah Menanix
Category: Cakes & Cupcakes
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Cakes & Cupcakes, Desserts, Flour, Gluten Free Desserts, Gluten-Free, Meal Type, Millet Flour, Oat Flour, Special Diet, Sweet Rice Flour

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15 Comments

  1. MatchaMe -

    May 14, 2019 at 7:37 pm

    Reminds me of the betty crocker devils food cake, which for a basic on the shelf package cake, is pretty good. I can only imagine how delicious a home made version would be!

    -Jared

    Reply
  2. Linda -

    May 15, 2019 at 2:04 pm

    Any way to convert this to using Better Batter flour? Thank you so much. Looks delicious.

    Reply
    • Sarah Menanix -

      May 15, 2019 at 2:46 pm

      When I first started making a version of this cake years and years ago, I used a different blend of flour that included rice flour, etc. and it worked great. While I’ve never used Better Batter, to convert it, I would use the same amount of Better Batter by weight (not volume) and it should work great!

      Reply
  3. Natalie -

    May 18, 2019 at 9:32 pm

    This chocolate sheet cake looks so delicious and perfect for parties!

    Reply
  4. sheenam @ thetwincookingproject -

    May 19, 2019 at 7:40 am

    Oh my!!! These look gorgeous!!! so happy to have landed on your blog via foodgawker. Subscribed right away :)

    Reply
  5. Laura -

    June 18, 2019 at 6:57 am

    Substitute sweetener for sugar ???
    How about monk fruit or coconut sugar
    Still work?
    My daughter is following a autoimmune protocol
    No sugar, grain, dairy soy and gluten free
    It’s so hard

    Reply
  6. Anj -

    September 5, 2019 at 8:51 am

    Is there anyway to make this without the eggs? My little one had egg and gluten allergy. Thanks.

    Reply
    • Sarah Menanix -

      September 6, 2019 at 9:56 am

      Yes! A friend of mine made a vegan version of this cake and used 1/4 cup aquafaba in place of each egg – you can see her variation here!

      Reply
  7. Rose -

    February 3, 2020 at 4:39 am

    What can I use if the person the cake is for cannot eat oats either?

    Reply
    • Sarah Menanix -

      February 6, 2020 at 10:04 pm

      While I haven’t tried it, I’d recommend substituting the oat flour with sorghum or teff flour by weight!

      Reply
  8. Debbie Elder -

    February 17, 2020 at 10:49 am

    Any chance you can get 25 portions or more out of this cake?

    Reply
    • Sarah Menanix -

      February 17, 2020 at 10:59 pm

      Oh I totally think you could! Cut it into 2.5 x 1.75 inch rectangles. For reference, it’s 3x my cupcake recipe that makes a dozen each, so this cake will easily serve 25, if not more!

      Reply
  9. Lynne Cook -

    May 25, 2020 at 3:39 pm

    This recipe absolutely does not work with all purpose gluten free flour substituted in equal measure in place of the suggested flours. I found this out the hard way – the cake literally comes out with a heavy, rubbery, tire-like texture. It does work beautifully when the recipe is followed exactly, using the recommended flours. I baked it for the second time today, following the recipe exactly. It looks much better, and I cut a corner off for examination and tasting before frosting, just to make sure. My family of five, four of whom are celiacs, is looking forward to devouring it after dinner this evening.

    Reply
    • Sarah Menanix -

      May 27, 2020 at 2:09 pm

      Unfortunately, all the all-purpose gluten-free flours are very different so some may work well for cake and others won’t (and always subbing out by weight and not cup measure as some weigh more than others due to the starch content and grind). This is why I prefer to bake with my own blends! Which one did you try here? For cakes, I would recommend Bob’s Red Mill 1-to-1 subbed out by weight (though I haven’t tried it with this specific recipe!).

      Reply
    • Sarah Menanix -

      May 27, 2020 at 2:10 pm

      That being said, I’m so glad you gave it another try with the recommended flours and it turned out as expected!

      Reply

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Sarah Menanix

I’m Sarah (aka Snix)! Welcome to Snixy Kitchen - where I create gluten-free recipes with fresh, local ingredients to tell stories about my life.

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