Fluffiest Oat Flour Cake Recipe (Made in 5-Minutes)
It's absolutely true! This recipe for the fluffiest oat flour cake comes together in 5 minutes using a blender or bowl and uses only oats for the flour! Simply blend oatmeal into flour, mix in remaining ingredients, pour and bake. Through my baking with oat flour experiments and expertise, I've learned yogurt adds moisture and a precise ratio of oats yields a light and fluffy texture, instead of dense or heavy. Once the cake cools, dollop on the quick brown sugar frosting and you have a gluten-free dessert to top all oat flour cake recipes!
Preheat the oven to 350ºF. Grease a 8X8-inch baking dish with nonstick cooking spray. Set aside.
Blender Method - Place 2 cups rolled oats in a powerful high speed blender, such as a Vitamix. Process into a fine, powdery flour, about 30-60 seconds. Add the remaining dry ingredients - granulated sugar, brown sugar, cornstarch, baking powder, baking soda, cinnamon, and salt. Pulse to combine. Hand Mixer Method - Add the oat flour and remaining dry ingredients to a large bowl. Mix together on low speed.
2 cups gluten-free certified rolled oats, ½ cup granulated sugar, ¼ cup light brown sugar, 2 tablespoons cornstarch, 1 ½ teaspoon baking powder, ½ teaspoon baking soda, 1 teaspoon ground cinnamon, ¼ teaspoon salt
Blender Method - Add the wet ingredients - eggs, milk, yogurt, oil, and vanilla. Process again to combine, scraping down blender if necessary. The batter will be very thin. Hand Mixer Method - Whisk together the wet ingredients in a separate medium bowl. Add to the dry ingredients and beat on medium speed to combine. The batter will be very thin.
2 large eggs, ¾ cup milk, ½ cup yogurt, ¼ cup oil, 2 teaspoon vanilla extract
Add in the remaining ⅓ cup rolled oats. Pulse to combine in the blender, or mix on low speed with hand mixer. Let the batter sit at room temperature for 10 minutes. This allows time for the oats to soak up excess moisture and bind the crumb.
⅓ cup old fashioned rolled oats
Pour the cake batter into the prepared baking pan. Bake for 38-40 minutes, or until firm to the touch in the center and a toothpick comes out clean. Cool completely on a wire rack before frosting.
For the frosting, melt together the butter and brown sugar in a medium saucepan over medium low heat, stirring constantly.
2 tablespoons butter, 2 tablespoons light brown sugar
Remove from the heat and stir in the powder sugar and milk. Start with 2 tablespoons milk, adding up to 1 tablespoon more, depending on desired thickness for spreading. Spread on cooled cake.
1 ¾ cup powdered sugar, 2-3 tablespoons milk
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Notes
Storing Tips
Store leftover cake at room temperature, covered securely with plastic wrap, up to 3 days. Avoid refrigerating or the cake will dry out.To freeze, wrap securely either frosted or unfrosted. If the cake is frosted be sure the wrapping doesn't directly touch the frosting. Alternatively, freeze the frosted cake first and then wrap. Freeze up to 2 months and thaw at room temperature.
Additions and Modifications
Old Fashioned Spiced Cake - Mix in 1 tsp cinnamon, ½ tsp ground ginger, ½ tsp ground nutmeg, ½ tsp ground cloves.
Stir in ⅓ cup raisins or ⅓ cup miniature chocolate chips.
Stir in ⅓ cup nuts, such as chopped pecans or walnuts into the cake batter or sprinkle candied pecans on top of the glaze frosting.
Vanilla cake - Omit the cinnamon.
Replace the frosting with a cream cheese frosting.