Step 1

Preheat oven to 350 degrees.

Step 2

Line a 9-inch square baking pan with parchment paper or spray with cooking spray.

Step 3

Beat together the butter and sugar until fluffy. Add the eggs.

Step 4

Once the eggs are incorporated, add lemon juice and combine.

Step 5

Whisk together flour, baking powder and salt, then add to the wet ingredients, mixing until just combined.

Step 6

Fold in the blackberries.

Step 7

Using a rubber spatula, spread the batter into the prepared pan.

Step 8

Bake 30-35 minutes, until cooked through. Edges will be slightly browned and a toothpick inserted in the center will come out clean. Let cool completely (about 1 hour).

Step 9

In a small saucepan combine blackberries, sugar and lemon juice. Bring to a boil, reduce heat and simmer 2-3 minutes, until sugar dissolves and the blackberries start to break down. Process with a food processor or blender, then pass through a fine mesh sieve to get rid of any seeds.

Step 10

Add powdered sugar to a small bowl and start by adding the berry puree, tablespoon by tablespoon, until the glaze is your desired consistency. Spread glaze over cooled blondies and serve.