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Snixy Kitchen

A Bay Area gluten-free food blog with original seasonal recipes

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Chestnut Plum Upside-Down Cake (gluten-free)

August 1, 2017 by Sarah Menanix

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Last updated on April 8th, 2019

Summery sweet tart plums or pluots blanket a light tender chestnut flour crumb in this gluten-free chestnut plum upside-down cake. Chestnut flour’s nutty earthy notes balance the sweetness of candy-like baked stone fruit.

Chestnut Plum Upside-Down Cake - Gluten-Free

My summer meal plan consists of approximately 75% fruit – stone fruit, berries, grapes, you name it. And 30% cake, with a 5% overlap that is fruit in cake. Or on cake as in the case of this gluten-free chestnut-flour plum upside-down cake…or does that make it fruit under cake?  Whatever you call it, I just made this cake three times in one week because I “forgot” to write down the final recipe (yes, again), but now I’m questioning whether that mistake was subconsciously intentional because now I have MORE CAKE(!!). That summer eating ratio might not be as much of an exaggeration as you may think. There are two cakes sitting on my counter right now and Lucas and I plan to ration them out between breakfast, lunch dessert, snack, and dinner dessert for the next two days.

JK – I’m sending one to his office tomorrow because I can’t be trusted around this chestnut plum upside-down cake.

I’ll still devour the other one though.

Flavor King Pluots

Chestnut Flour

Plum Upside-Down Cake

While I really really love them, up until recently, I would avoid buying plums or pluots because I just couldn’t seem to consistently pick flavorful ones. If I did buy them, it’d be a crapshoot whether they tasted like anything more than textured water. Tell me you relate – I can’t be the only one with bad plum-picking luck, right?

Fortunately, we live down the block from a small organic natural grocery with approximately 2-3 dozen stone fruit varieties. So last week, I came home with one of each plum or pluot cultivar for taste-testing purposes. But I also wanted to test this cake, so I went with my gut and also got a whole bag of the deepest darkest ruby plums.

Plum Upside-Down Cake

Chestnut Plum Upside-Down Cake - Gluten-Free

Chestnut Plum Upside-Down Cake - Gluten-Free

My gut was wrong. If I ranked the plums in order of flavor, the one I now had 3lbs of would come in dead last. In first place? A crisp showy pluot – of which I now had none left for cake. I should have known – it was called a Flavor King Pluot, after all – but I thought that was a ploy! Like the random friend who is like “I’m really really good at cutting hair. LET ME DO IT. TRUST ME.” Definitely do not trust them. No one likes a braggart.

Unless we’re talking about pluots. In which case, pick the one that straight up tells you it’s boss. Flavor King – No B.S. Brag away, buddy – you taste like candy.

And just ten minutes after walking out, I was back at the market to turn in my sad tasteless plums for these vibrant pluots because cake deserves it. So this cake actually has pluots in it because they won the taste-test, but plums will work just the same!

Chestnut Plum Upside-Down Cake - Gluten-Free

Chestnut Plum Upside-Down Cake - Gluten-Free

Chestnut Plum Upside-Down Cake - Gluten-Free

Chestnut Plum Upside-Down Cake - Gluten-Free

Chestnut Plum Upside-Down Cake - Gluten-Free

Chestnut Plum Upside-Down Cake - Gluten-Free

This gluten-free chestnut-flour cake started as a skillet cake with the plums fanned out over top, but they sank, leaving little pockets of gooey cake in their wake. So since they wanted to be on the bottom, that’s where they went – taking a cue from the upside-down peach cake Alanna and I recently styled for NYT. Chestnut flour’s sweet earthy notes pair beautifully with sweet tangy stone fruit, while creating a soft tender crumb that’s both light and chewy.

When I lamented having to make this cake again to figure out which recipe was the right one, Lucas simply reminded me that we’d get to eat this cake again and the clouds parted while the sun shone brightly down.

And anyway, we really could use more cake: by the end of this shoot, guess how many pieces of cake Zoella had stuck her hand into from the edge of my suddenly-too-low-toddler-height-shooting-table? Three. Three pieces of cake.

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Chestnut Plum Upside-Down Cake - Gluten-Free

Chestnut Plum Upside-Down Cake (gluten-free)

Yield: 1 8-inch round cake or 8 slices

Ingredients

  • 4 medium to large ripe but firm plums or pluots*, cut off the core and sliced 1/8 to ¼-inch thick
  • 3/4 cup + 1 tablespoon granulated sugar, divided
  • ½ cup + 2 tablespoons (74g) chestnut flour (I use Calleris)
  • ½ cup + 1 tablespoon (90g) sweet rice flour (such as Mochiko - different from "white rice flour" or "brown rice flour")
  • ½ cup (55g) gluten-free oat flour
  • ½ teaspoon xanthan gum
  • ½ teaspoon baking soda
  • 1½ teaspoons baking powder
  • ½ teaspoon kosher salt
  • ½ cup unsalted butter, softened to room temperature
  • 2 large eggs, room temperature
  • 2 teaspoons pure vanilla extract
  • 1/2 cup whole milk
  • Neutral oil, such as sunflower, for greasing the pan
  • Honey, for brushing the cake

Instructions

  1. Grease an 8" baking pan with oil and line the bottom with a round of parchment paper.
  2. Arrange the plums in concentric overlapping circles on top of the parchment paper and sprinkle with 1 tablespoon of the sugar.
  3. Preheat the oven to 350°F.
  4. In a medium bowl, sift together the chestnut flour, sweet rice flour, oat flour, xanthan gum, baking soda, baking powder and salt. Set aside.
  5. In the bowl of a stand mixer, cream together the butter and remaining 3/4 cups sugar over medium speed until light and fluffy, 3-4 minutes.
  6. With the mixer on low-speed, add the eggs one at a time, mixing after each one.
  7. Add the vanilla extract, mixing until just combined.
  8. Keeping the speed on low, slowly add the dry ingredients in two batches, adding the milk in between, mixing until just combined.
  9. Pour the batter over the plums and use a spatula to smooth it out.
  10. Bake for 50-60 minutes, or until the center bounces back when touched and a toothpick inserted in the center comes out clean or with just a few moist crumbs. Place pan on a wire rack to cool completely (I left mine overnight).
  11. When completely cool, use a thin knife to loosen the edges of the cake. With a plate or second wire rack on top, invert the cake, giving it a few taps as needed to release it from the pan. Carefully peel off the parchment paper.
  12. Just before serving, brush the top with a little bit of honey to glisten up the fruit. Slice and serve as is, or with a scoop of vanilla ice cream.

Notes

*I used Flavor King pluots because they had the most flavor.

**I've baked a version of this cake without the xanthan gum and, while it works, I think the texture of the xanthan gum cake is better - it's chewier and less crumbly, as a cake should be.

© Sarah Menanix

Chestnut Plum Upside-Down Cake - Gluten-Free

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Cakes & Cupcakes, Chestnut Flour, Desserts, Fruit, Gluten Free Desserts, Oat Flour, Summer, Sweet Rice Flour

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16 Comments

  1. Katie | Healthy Seasonal Recipes -

    August 2, 2017 at 4:15 am

    I literally LOLed about the haircut/ Flavor King pluot braggart commentary Sarah! Too funny! Love the way this cake looks, and that you turned it upside down! What a delight to see it turned-out of the pan.

    Reply
  2. michelle @ hummingbird high -

    August 2, 2017 at 5:40 am

    omg flavor king pluots are my fave too. they really do taste like candy (despite their braggy name, lol)!!! and i also discovered them for the first time when i was living out in sf.

    this cake looks AMAZING btw.

    Reply
  3. sarah -

    August 3, 2017 at 9:25 am

    This looks amazing! I have to laugh about the bad tasting plums story. I have had that too… Flavor King is Great. I also like Flavor Queen ,but they are a yellowish green so wouldn’t look nice with this recipe.

    Beautiful!

    Reply
  4. Karen @ The Food Charlatan -

    August 3, 2017 at 10:54 am

    The haircut friend!!!!! So awkward!!!!! This cake is gorgeous and I would probably make it 3 times too. Also, fruit in cake makes it breakfast.

    Reply
  5. betty -

    August 3, 2017 at 5:58 pm

    Oh, SO pretty. I love how ombre the plums turned out, and hurrah to 75% fruit diet in the summer (as I sit around eating watermelon for dinner). Heheh. Miss you my dear!

    Reply
  6. Shelly @ Vegetarian 'Ventures -

    August 4, 2017 at 2:17 pm

    Oh my goodness – this is seriously the most gorgeous cake ever, Sarah! Those hues in the plums are out of this world! I totally also struggle with finding stone fruit that consistently taste delicious – I’ve mostly been holding out for our weekend markets since you usually can’t go wrong with getting them straight from the farmers.

    Reply
  7. Ashley @ The Naked Food Life -

    August 5, 2017 at 8:51 am

    Gorgeous! Craving a piece right NOW!

    Reply
  8. Christiann Koepke -

    August 5, 2017 at 4:06 pm

    This looks soooooo amazing and delish!! And love these photos!! – CK

    Reply
  9. Amanda Paa -

    August 6, 2017 at 6:52 am

    pretty cake, pretty you! i love the process photos. and what a fun little taste test, and an even more delicious cake result. imagining this with a different fruit each season! xo

    Reply
  10. DN -

    August 8, 2017 at 5:36 pm

    ½ xanthan gum – 1/2 what? Teaspoon, tablespoon

    Reply
    • Sarah Menanix -

      August 8, 2017 at 6:57 pm

      Oh my gosh! Thanks for the catch – it’s 1/2 teaspoon xanthan gum! Updating the recipe now…Sorry about that.

      Reply
  11. Carla -

    August 18, 2017 at 11:52 am

    Remember when you brought this to my house and it was delicious? If you forgot we can totally just do that again. ;)

    Reply
  12. Sara -

    August 24, 2017 at 3:49 pm

    Yum!! This looks incredible. Which brand chestnut flour do you use? Where do you buy it?

    Reply
    • Sarah Menanix -

      August 24, 2017 at 5:01 pm

      Thank you! I use Calleris brand, which I get at the Italian Market here in Berkeley. You can also find it online or at most Italian markets.

      Reply
  13. raimy -

    July 2, 2020 at 9:37 am

    if you don’t have chestnut flour, can we use almond flour or chickpea flour?

    Reply
    • Sarah Menanix -

      July 2, 2020 at 11:03 am

      Hm – chestnut flour bakes up much softer and cakier than almond or chickpea flour. If I were to substitute it, I would use 20g oat flour and 54g millet flour (though disclaimer that I haven’t tried it in this specific cake).

      Reply

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