Blueberry Upside Down Cake with Caramelized Top

This blueberry upside down cake bakes up with a glossy, jammy blueberry top that becomes the bottom once you flip it out. The cake itself is tender and buttery, and the whole thing comes together in one pan.

It is simple enough for a Tuesday night but pretty enough to dress up with a scoop of ice cream when company comes over.

Why This Blueberry Cake Works

The brown sugar and butter melt into a sticky caramel that coats every blueberry, so the fruit layer tastes deep and cooked without losing its freshness. There is no fancy technique, just a straightforward cake batter poured right over that hot fruit base.

Because the batter goes on top, the blueberries get protected from drying out and the cake stays moist all the way through. The crumb is soft with a fine, even grain, and you get all the good bits—warm berry, dark sugar, and tender cake—in each forkful.

Ingredients

• 4 tbsp unsalted butter: for the caramel and the pan.
• 1/2 cup packed light brown sugar: dark brown works too if you want a deeper flavor.
• 2 cups fresh or frozen blueberries: no need to thaw frozen berries.
• 1 1/2 cups all-purpose flour: spooned and leveled, not scooped.
• 1 1/2 tsp baking powder: check the expiration date so the cake rises.
• 1/4 tsp fine salt: balances the sweetness.
• 1/2 cup unsalted butter, at room temperature: a full stick, softened.
• 3/4 cup granulated sugar: gives the crumb a light sweetness.
• 2 large eggs, at room temperature: cold eggs can make the batter curdle.
• 2 tsp vanilla extract: rounds out the buttery flavor.
• 1/2 cup whole milk, at room temperature: any milk works in a pinch.

Variations / Substitutions

• Change the fruit: sliced peaches, plums, or nectarines work beautifully in the same amount.
• Dairy free swap: use a plant based butter stick and oat milk; the caramel may set a little softer but still works.
• Gluten free option: replace the flour with a 1 to 1 gluten free baking blend; the texture will be slightly more tender.
• Add lemon: stir a teaspoon of lemon zest into the cake batter to brighten the whole dish.

If you enjoy baking with stone fruit, you might like the peach version of this same method.

How to Make Blueberry Upside Down Cake

Step 1: Build the Blueberry Caramel

Preheat the oven to 350°F (175°C). Put the 4 tablespoons of butter in a 9 inch round cake pan and set the pan over medium heat on the stove just until the butter melts. Tilt the pan so the butter coats the sides, then remove it from the heat and stir in the 1/2 cup brown sugar until it forms a thick paste.

The mixture will look grainy and wet at first, then smooth out as the sugar absorbs the butter. Spread it evenly across the bottom of the pan and scatter the 2 cups of blueberries on top in a single layer.

Step 2: Cream the Butter and Sugar

In a mixing bowl, beat the 1/2 cup room temperature butter and the 3/4 cup granulated sugar together until light and fluffy, about 2 minutes with a hand mixer. Scrape down the sides, then add the 2 eggs one at a time, beating well after each, and mix in the 2 teaspoons vanilla.

The mixture should look pale and a little souffled. If it breaks or looks curdled, keep beating for another 30 seconds and it will usually come back together once the dry ingredients are added.

Step 3: Combine the Batter

Whisk the 1 1/2 cups flour, 1 1/2 teaspoons baking powder, and 1/4 teaspoon salt in a separate small bowl. Add half the flour mixture to the butter mixture and stir just until the streaks of flour disappear. Pour in the 1/2 cup milk and stir gently, then add the rest of the flour and fold until you have a smooth batter with no dry pockets.

A few small lumps are fine. Overmixing at this stage makes the cake tough, so stop as soon as the flour disappears.

Step 4: Pour and Bake the Cake

Spoon the batter over the blueberries in the pan and spread it gently to the edges with a spatula. It will cover the fruit completely. Bake for 40 to 45 minutes, until the top is golden brown and a toothpick inserted in the center comes out clean or with a few moist crumbs clinging to it.

The pan will look fairly full when it goes in, but the cake rises evenly and a light dome will puff up as it bakes. You will smell caramel and warm berries before the timer goes off.

Step 5: Flip and Serve the Cake

Let the cake cool in the pan on a wire rack for exactly 10 minutes. Run a thin knife around the edge to loosen it, place a serving plate upside down over the pan, and flip the whole thing over in one smooth motion. Lift the pan off and rearrange any blueberries that cling to the bottom back onto the cake.

Serve the cake warm or at room temperature, with the glossy blueberry layer on full display, and slice it right at the table.

Tips for the Best Blueberry Upside Down Cake

• A 10 minute rest before flipping gives the caramel a moment to set just enough to release cleanly; longer than that and it can start to stick.
• If a few blueberries stay stuck in the pan, spoon them out and tuck them back into the cake while it is still warm.
• A tiny pinch of flaky sea salt sprinkled over the top after flipping cuts the sweetness and makes the blueberry flavor pop.
• Use the back of a spoon to smooth the brown sugar butter paste into the corners of the pan so every bite gets some caramel.

Bake times by pan size:

Storing Leftovers

• Refrigerate: cover the cake and keep it in the fridge for up to 4 days; the top will soften but the flavor stays good.
• Reheating: warm individual slices in the microwave for 20 seconds or in a 300°F oven for 5 minutes to revive the caramel.
• Serve cold: the cake tastes nice straight from the fridge; the butter in the crumb stays firm and the blueberry layer gets jam like.

What to Serve With Blueberry Upside Down Cake

A scoop of vanilla ice cream melts into the warm cake and turns the caramel a little saucy. Lightly sweetened whipped cream keeps things airy, and a spoonful of lemon curd on the side adds a tang that plays off the brown sugar. If you pour a little cold heavy cream right over a warm slice, it seeps into the crumb and makes it extra rich.

Frequently Asked Questions

Is it hard to flip an upside down cake?

No. Waiting 10 minutes, running a knife around the edge, and using a quick confident flip usually does the trick.

Can I use a glass pan instead of metal?

Yes, but lower the oven temperature to 325°F and add about 5 minutes to the bake time so the cake cooks through without over browning.

Why did my cake stick to the pan?

Usually because it sat in the pan too long after cooling, letting the caramel harden and grab the metal. Stick to the 10 minute rest and flip right then.

Can I make this cake ahead of time?

Absolutely. Bake it in the morning, keep it at room temperature covered loosely, and serve it the same day for the best texture.

Blueberry Upside Down Cake Recipe

Print Recipe Pin Recipe

Prep Time 15 minutes mins

Cook Time 45 minutes mins

Total Time 1 hour hr

Servings: 8 servings

Calories: 345

Ingredients Method Notes

Ingredients

  

• 4 tbsp unsalted butter
• 1/2 cup packed light brown sugar
• 2 cups fresh or frozen blueberries
• 1 1/2 cups all-purpose flour
• 1 1/2 tsp baking powder
• 1/4 tsp fine salt
• 1/2 cup unsalted butter, at room temperature
• 3/4 cup granulated sugar
• 2 large eggs, at room temperature
• 2 tsp vanilla extract
• 1/2 cup whole milk, at room temperature

Method

 

1. Preheat the oven to 350°F. Melt 4 tbsp butter in a 9 inch round cake pan over medium heat, tilt to coat, then stir in brown sugar until smooth. Spread evenly and top with blueberries.
2. Beat the 1/2 cup butter and granulated sugar until fluffy, about 2 minutes. Add eggs one at a time, then vanilla, mixing after each.
3. Whisk flour, baking powder, and salt. Add half to the butter mixture, stir, then add the milk and the remaining flour, folding just until combined.
4. Spoon batter over the blueberries, spreading gently to cover. Bake 40 to 45 minutes until golden and a toothpick comes out clean.
5. Cool the cake in the pan for 10 minutes on a rack. Run a knife around the edge, invert onto a plate, and serve warm.

Notes

If using frozen blueberries, the caramel may bubble a little more as it bakes, which is normal. Let the cake cool for exactly 10 minutes before flipping; a longer rest can cause sticking.