Blackberry Bars

In the summer, I can't stop buying fruit. It's so good and so much cheaper. I decided I wanted to make a berry dessert to take to some friends for a cookout and found this recipe on Martha Stewart's website. These are very good and don't have a lot of ingredients, we had everything in the house already.

6 tablespoons unsalted butter melted, and 1/2 cup (1 stick), room temperature, plus more for pan

1 3/4 cups all-purpose flour (spooned and leveled), plus more for pan

1/2 cup packed light-brown sugar

1/2 teaspoon salt

1/2 teaspoon baking powder

1 cup confectioners' sugar

1/2 teaspoon pure vanilla extract

2 large eggs

2 containers (5 ounces each) blackberries

Preheat oven to 350 degrees. Butter an 8-inch square baking pan. Line bottom with parchment paper, leaving an overhang on two sides; butter and flour paper, tapping out excess.

Make topping: In a medium bowl, whisk together melted butter, brown sugar, and 1/4 teaspoon salt; add 1 cup flour, and mix with a fork until large moist crumbs form. Refrigerate topping until ready to use.

In a medium bowl, whisk together remaining 3/4 cup flour, baking powder, and remaining 1/4 teaspoon salt; set aside. In a large bowl, using an electric mixer, beat room-temperature butter, confectioners' sugar, and vanilla until light and fluffy; add eggs, one at a time, beating well after each addition. Reduce speed to low; mix in flour mixture. Spread batter evenly in pan; sprinkle with blackberries, then chilled topping.

Bake until golden and a toothpick inserted in center comes out with moist crumbs attached, 40 to 45 minutes. Cool completely in pan. Using paper overhang, lift cake onto a work surface; cut into 16 squares.