Instructions:
- Preheat and prepare pan:
Preheat oven to 350°F (175°C). Line an 8×8-inch baking dish with parchment paper or grease lightly. - Make the cookie dough:
Cream butter and sugar until light and fluffy. Beat in egg, vanilla, lemon juice, and zest until fully combined. - Add dry ingredients:
In a separate bowl, whisk together flour, baking powder, and salt. Gradually mix into the wet ingredients to form a soft dough. - Fold in mix-ins:
Gently fold in blueberries and white chocolate chips, taking care not to crush the berries. - Bake:
Spread the dough evenly into the prepared dish. Bake for 28–32 minutes, or until golden and a toothpick comes out clean. - Cool and drizzle:
Cool completely. Melt extra white chocolate (with coconut oil if using) and drizzle over the top. - Slice and serve:
Cut into 16 squares. Serve at room temperature or slightly chilled for a firmer texture.
Variations:
- Swap white chocolate chips for lemon-flavored chips or chopped macadamias for added crunch.
- Use frozen blueberries (do not thaw) if fresh are unavailable—just add a few minutes to the bake time.
- Add a dash of almond extract for a subtle nutty background note.
Tips:
- Zest the lemons before juicing for best results.
- For sharp drizzle lines, use a piping bag or a zip-top bag with the corner snipped.
- Store chilled in an airtight container for up to 5 days.
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These cookie bars are a celebration of citrus and summer berries, and the drizzle is the perfect finishing touch—sweet, creamy, and visually striking.