Blackberry Crumb Cake

Set the oven rack in the center position. 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 ¼ 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 ¼ 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, 45 to 50 minutes. Cool completely in pan. Using paper overhang, lift cake onto a work surface; cut into 16 squares.