Blueberry Upside Down Cake That Doesn't Get Soggy — Finally
Every blueberry upside down cake I made before this one had the same problem: a beautiful top hiding a soggy bottom. This version flips out with a tender golden crumb and caramelized berries that hold their shape. The secret? A quick toss of the berries in flour before layering. It takes thirty seconds and changes everything.
Equipment
- 9-inch round cake pan (at least 2 inches deep)
- Mixing bowls (medium and small)
- Whisk
- Rubber spatula
- Electric mixer (hand or stand)
- Cooling Rack
- Serving plate with a lip
Ingredients
- 2 cups fresh or frozen blueberries (do not thaw if frozen)
- 1/4 cup unsalted butter, for topping
- 1/2 cup packed brown sugar (dark or light)
- 1/2 cup unsalted butter, softened, for batter
- 3/4 cup granulated sugar
- 1 large egg
- 1 egg yolk
- 1 teaspoon vanilla extract
- 1 1/2 cups all-purpose flour
- 1 tablespoon all-purpose flour (for tossing berries)
- 1 teaspoon baking powder
- 1/2 teaspoon baking soda
- 1/4 teaspoon salt
- 1 cup buttermilk
Instructions
- Preheat oven to 350°F. Position a rack in the center and place a baking sheet on the lower rack to catch drips.
- Make the caramel topping: Place 1/4 cup butter in your cake pan and put it in the oven for 2-3 minutes until melted. Remove carefully, then sprinkle 1/2 cup brown sugar evenly over the melted butter. Stir gently with a fork until smooth and combined. Set aside to cool for 3 minutes.
- Prep the berries: In a small bowl, toss the blueberries with 1 tablespoon of flour until lightly coated. Layer them evenly over the caramel mixture in the pan.
- Whisk dry ingredients: In a medium bowl, whisk together 1 1/2 cups flour, baking powder, baking soda, and salt. Set aside.
- Cream butter and sugar: In a large bowl, beat 1/2 cup softened butter and 3/4 cup granulated sugar together until light and fluffy, about 2-3 minutes. Add egg and egg yolk one at a time, beating well after each. Beat in vanilla.
- Add dry and wet alternately: With mixer on low, add half the dry ingredients, then half the buttermilk, then the rest of the dry, then the rest of the buttermilk. Mix just until combined. Batter will be thick and scoopable.
- Assemble and bake: Spoon batter gently over the blueberries in the pan. Spread evenly. Bake 40-45 minutes until deep golden brown and edges pull away from the pan.
- Rest before flipping: Place pan on a cooling rack and let rest exactly 5 minutes. Set a timer. Do not skip.
- Flip the cake: Place serving plate upside down over the pan. Holding together firmly with oven mitts, flip over. Let pan sit on top for 30 seconds without lifting. Then lift pan slowly. If a few berries stick, press them back into place with a finger.
Notes
Make ahead: This cake tastes better the day after it's made. Store covered at room temperature for up to 2 days (not in the fridge). Freeze un-flipped cake in the pan, wrapped tightly, for up to 3 months. Thaw overnight in the fridge, then warm in a 300°F oven for 10 minutes before flipping.
Substitutions: For gluten-free, use 1:1 gluten-free flour blend in the batter and for the berries. Swap half the blueberries for raspberries or blackberries for a mixed berry version. Add 1 teaspoon lemon zest for a lemon-blueberry variation. No buttermilk? Add 1 tablespoon lemon juice or vinegar to a cup of whole milk and let sit 5 minutes.
Honest advice: Use a 9-inch pan at least 2 inches deep. Don't thaw frozen berries. The 5-minute rest is essential. Even if the top cracks, the caramel hides everything.