Strawberry Upside Down Bars

These old-fashioned upside-down bars are a hidden gem worth knowing. Fresh strawberries are layered on the bottom of the pan, then covered with a rich brown sugar batter that bakes into a dense, buttery bar. When you flip them out, the berries become the star of the show — jammy and jewel-bright on top, with a beautiful caramelized finish from the brown sugar. A dusting of powdered sugar is all they need. They’re a perfect use for peak-season strawberries and a great take-along for potlucks, picnics, or summer gatherings.

5 from 6 votes

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Course: Dessert

Cuisine: American

Keyword: Strawberry Upside Down Bars

Prep Time: 15

Cook Time: 1 45

Servings: bars

Calories: 286kcal

Equipment

Ingredients

For the Pan:

1 tablespoon unsalted butter softened
3 tablespoons packed light brown sugar
2 cups fresh strawberries hulled and thinly sliced (about ¼ inch thick)

Dry Ingredients:

1½ cups all-purpose flour
1 teaspoon baking powder
¼ teaspoon salt

Wet Ingredients:

¾ cup 1½ sticks unsalted butter melted and slightly cooled
1¼ cups light brown sugar packed
2 large eggs
2 teaspoons pure vanilla extract

For Serving:

Powdered sugar for dusting (optional)

Instructions

Preheat: Position oven rack in the center of the oven and preheat to 350°F. Line an 8×8-inch baking pan with parchment paper, leaving some overhang on two sides for easy removal.
Butter and sugar the pan: Grease the parchment with the 1 tablespoon softened butter, then sprinkle with 3 tablespoons packed light brown sugar, spreading into an even layer.
Arrange strawberries: Layer the sliced strawberries across the bottom of the pan in overlapping rows, covering the entire surface. Set aside. Note: I like to slice the strawberries vertically, so the slices are more uniform.
Combine dry ingredients: In a medium bowl, whisk together flour, baking powder, and salt. Set aside.
Mix wet ingredients: In a large bowl, beat together the melted butter and 1¼ cups packed light brown sugar until well combined.
Add eggs and vanilla: Add the eggs and vanilla extract to the butter mixture; mix on low speed until incorporated.
Combine: Add the flour mixture and mix until fully combined. The batter will be thick.
Spread batter: Drop spoonfuls of batter over the strawberry layer. Using short, careful strokes with a spatula, spread into an even layer, taking care not to disturb the strawberries below.
Bake: Bake for 40-45 minutes, until the top is deep golden brown and a toothpick inserted in the center comes out clean.
Cool completely: Let the bars cool in the pan on a wire rack for at least 1 hour. Do not attempt to invert until completely cool.
Turn out: Place a cutting board or large flat plate firmly over the top of the pan. Holding both together securely, flip in one confident motion. Set down and lift the pan straight up.
Remove parchment: Carefully peel back the parchment paper. If any strawberries stick, press them gently back into place.
Slice: Cut into 12 squares with a sharp knife, wiping the blade between cuts for clean edges. Dust with powdered sugar just before serving, if desired.

Notes

STORAGE
Store bars in an airtight container at room temperature for up to 2 days, or refrigerate for up to 4 days. Because of the fresh strawberries, these bars are best enjoyed within the first 2 days. They do not freeze well.
ANGELA’S TIPS
Visual cues for doneness: The top should be deep golden brown and feel firm when gently pressed in the center. A toothpick inserted in the middle should come out clean — not wet or sticky. The long bake time is normal; fresh strawberries release a lot of moisture into the batter, which slows things down. Start checking at 35 minutes, since every oven is a little different.
Cool completely before inverting: This is the most important tip! Warm bars will fall apart when flipped. The full hour of cooling allows the bars to firm up and set so they release cleanly. If you’re short on time, refrigerate for 30 minutes after the initial cooldown before inverting.
The flip: Place your cutting board directly over the pan, hold them firmly together with both hands, and flip in one confident motion — no hesitation. Lift the pan straight up. Have a small spatula nearby in case any berries need to be nudged back into place; it’s an easy fix.
Strawberry prep matters: Thin, even slices (¼ inch) work best — they bake into the bars more evenly and release more cleanly when inverted. Very thick slices can create air pockets under the batter. Medium-sized berries are ideal; very large berries can be halved lengthwise before slicing.
Variations: Raspberries or a mix of sliced peaches and strawberries work beautifully here. Keep the total fruit amount the same and slice everything to a similar thickness so the batter covers evenly.

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