Cinnamon Flop Cake with Brown Sugar Topping
A simple yet indulgent cake featuring a tender crumb with a dramatic cinnamon-brown sugar layer that sinks into the batter during baking, creating a fudgy streusel-like bottom. The name comes from the topping's tendency to "flop" or settle into the cake, transforming into a moist, molasses-tinged layer. Serve warm with coffee or vanilla ice cream for a homey dessert that feels special without fussy techniques. This version uses a straightforward creaming method and standard pantry ingredients, making it approachable for novice bakers.
Ingredients
- 1 ½ cup granulated sugar
- 4 tablespoon salted butter, softened
- 1 egg, lightly beaten
- 1 teaspoon vanilla extract
- 2 cup all-purpose flour, siftedcake flour0.9:1tender
note: use 1.8 cups cake flour for lighter crumb
- 2 teaspoon baking powder
- 1 cup milkbuttermilk or greek yogurt thinned with waterequaltang
note: adds subtle tang and richness
Full guide → - 1 cup brown sugar, packed
- 1 teaspoon cinnamon
- 2 tablespoon salted butter, melted
Instructions
- 1
Preheat oven to 375F.
- 2
Lightly grease a 9x9-inch pan.
- 3
Cream granulated sugar with softened butter until resembling snow.
- 4
Add egg and vanilla extract, mix until well combined.
- 5
Whisk flour with baking powder in a separate bowl.
- 6
Alternate adding flour mixture and milk to the batter, mixing well after each addition.
- 7
Mix brown sugar and cinnamon in a medium bowl.
- 8
Melt butter and stir into brown sugar mixture until combined.
- 9
Pour cake batter into prepared pan.
- 10
Sprinkle brown sugar mixture evenly over batter.
- 11
Bake for 30 to 35 minutes until a toothpick inserted in center comes out with a few crumbs.
- 12
Cool for 15 minutes, then serve warm.
Tips
Do not overmix the batter once you add the flour, as this develops gluten and toughens the cake. Mix just until the flour streaks disappear.
For the best fudgy bottom layer, use freshly melted butter mixed into the brown sugar topping, ensuring even distribution across the batter.
Serve while still warm so the caramelized sugar layer maintains its soft, molasses-like texture before cooling fully.
Good to Know
Keep covered at room temperature for up to 2 days. The cake stays moist due to the fudgy bottom layer.
Prepare the dry ingredients and measure wet ingredients the night before. Assemble and bake the same day for optimal texture.
Serve warm with vanilla ice cream, whipped cream, or black coffee. Equally good at breakfast, dessert, or casual gatherings.
Common Mistakes
Do not skip sifting the flour to avoid dense, gummy layers in the finished cake.
Do not overbake past 35 minutes to avoid drying out the top layer and losing the fudgy bottom texture.
Substitutions
note: adds subtle tang and richness
Full guide →FAQ
Can I make this in a different size pan?
Yes, but adjust baking time. An 8x8-inch pan will bake slightly faster (25-30 minutes), while a 9x13-inch will take longer (35-40 minutes). Check doneness with a toothpick at the minimum time.
What if my brown sugar topping sinks completely into the batter?
This is intentional and creates the signature fudgy layer. However, ensure you sprinkle it evenly across the surface and don't press it down. Some settling is normal and desirable.
How long does this cake keep and can I freeze it?
Store covered at room temperature for up to 2 days. Wrap unfrosted cake tightly and freeze for up to 3 months. Thaw at room temperature before serving warm.