# What You'll Need:
→ Blondie Base
01 - 1/2 cup unsalted butter, melted and slightly cooled
02 - 3/4 cup light brown sugar, packed
03 - 1/4 cup granulated sugar
04 - 1 large egg
05 - 1 1/2 teaspoons pure vanilla extract
06 - Zest of 1 lemon
07 - 2 tablespoons fresh lemon juice
08 - 1 1/2 cups all-purpose flour
09 - 1/2 teaspoon baking powder
10 - 1/4 teaspoon fine sea salt
→ Mix-ins
11 - 1/2 cup white chocolate chips or chopped white chocolate
12 - 3/4 cup fresh blueberries, plus a few extra for topping
# Step-by-Step Guide:
01 - Preheat the oven to 350°F. Line an 8-inch square baking pan with parchment paper, leaving an overhang for easy removal.
02 - In a large mixing bowl, whisk the melted butter with the brown sugar and granulated sugar until the mixture is smooth and glossy.
03 - Whisk in the egg, vanilla extract, lemon zest and lemon juice until fully incorporated.
04 - Sift together the all-purpose flour, baking powder and salt in a separate bowl, then add the dry mixture to the wet ingredients and stir gently until just combined; avoid overmixing.
05 - Carefully fold the white chocolate chips and blueberries into the batter so they are evenly distributed without crushing the fruit.
06 - Spread the batter evenly in the prepared pan, smoothing the top with a spatula; dot with a few extra blueberries and white chocolate chips if desired.
07 - Bake for 28–32 minutes, or until the center is just set and the edges are lightly golden; a toothpick inserted near the center should come out with a few moist crumbs.
08 - Allow the bars to cool completely in the pan, then lift them out using the parchment overhang and slice into 12 squares.
