Bright citrus and plump berries come together in one easy tray bake that tastes like summer. These blueberry lemon blondies are buttery, tender, and finished with a glossy lemon-blueberry glaze. They’re simple to make, travel well, and vanish fast at potlucks and picnics.
Why this lemon-blueberry blondie stands out
The combination of fresh lemon zest and juice lifts the rich butter base. Blueberries add bursts of juice and color. The result is a dessert that balances sweet and tart in every bite.
- Texture: soft, slightly cakey interior with golden edges.
- Flavor: bright lemon against mellow brown-butter notes.
- Visual appeal: purple-blue streaks under a pale glaze.
Ingredients for a single 8×8 pan
Gather basic pantry items plus fresh lemons and berries. Quantities below yield about nine squares.
- 1 cup all-purpose flour
- 1/4 teaspoon baking powder
- 1/4 teaspoon fine salt
- 1/2 cup unsalted butter, softened
- 3/4 cup granulated sugar
- Zest of 1 lemon
- 1 large egg, room temperature
- 1/4 cup freshly squeezed lemon juice
- 1 cup fresh blueberries
Simple lemon-blueberry glaze options
Choose a classic lemon glaze or a purple blueberry-laced version for contrast.
- Lemon glaze: 1 cup sifted powdered sugar + about 2 Tbsp lemon juice.
- Blueberry glaze: pulse 1 heaping Tbsp frozen blueberries with lemon juice, strain, then whisk into powdered sugar.
Step-by-step baking directions
Follow these steps for reliably tender blondies. Work quickly once the wet and dry ingredients meet.
- Preheat oven to 350°F (175°C). Line an 8×8-inch pan with parchment, leaving an overhang.
- Whisk together flour, baking powder, and salt in a bowl. Set aside.
- Cream the softened butter with sugar and lemon zest until pale and fragrant, about 1–2 minutes.
- Beat in the egg until incorporated. Add lemon juice and stir until the mixture is cohesive.
- Fold the dry ingredients into the wet just until combined. Avoid overmixing.
- Gently fold in the blueberries, saving a handful for the top if you like.
- Spread batter evenly in the prepared pan and bake 25–30 minutes, until edges are golden and the center is set.
- Cool to room temperature on a rack before glazing.
How to make and apply the glaze
Make the glaze while the blondies cool. The glaze should be thick enough to coat but thin enough to spread.
- For lemon glaze, whisk powdered sugar with lemon juice until smooth. Add juice sparingly.
- For blueberry glaze, pulse frozen blueberries with lemon juice, strain, then mix the juice into powdered sugar.
- Spread the glaze over cooled blondies. Let it set for about 10 minutes before slicing.
Baking tips and serving ideas
- Use fresh blueberries for bursts of juice. Frozen will work but may color the batter.
- Room-temperature egg and butter blend more evenly.
- To remove blondies cleanly, lift them out using the parchment overhang before slicing.
- Serve warm with a dollop of whipped cream or chilled with a scoop of vanilla ice cream.
- Storage: keep in an airtight container at room temperature for 2–3 days, or refrigerate up to a week.
Time, yield and category
- Prep time: 10 minutes
- Cook time: 25 minutes
- Total time: about 35 minutes
- Yield: roughly 9 squares
- Category: dessert — method: bake
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