Ingredients
- Nonstick vegetable oil spray (for pan)
- 1½ cups (300 g) granulated sugar
- 1 cup (160 g) oat flour
- ½ cup (60 g) mochiko (sweet rice flour; such as Koda Farms)
- 2 tsp. Diamond Crystal or 1¼ tsp. Morton kosher salt
- 1½ tsp. baking powder
- ½ tsp. baking soda
- ¼ tsp. xanthan gum
- 1 cup (85 g) Dutch-process cocoa powder
- ⅓ cup vegetable oil
- 2 large eggs
- ⅔ cup buttermilk
- 1 Tbsp. vanilla bean paste or vanilla extract
- 1 cup (110 g) powdered sugar
- ¼ cup (21 g) Dutch-process cocoa powder
- 2 tsp. vanilla bean paste or vanilla extract
- 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt
- 8 oz. semisweet or bittersweet chocolate (68–70% cacao)
- 1 cup (2 sticks) unsalted butter, room temperature
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