Blackberry Crumb Cake

Preheat oven to 350ºF. Prepare an 8-inch square baking pan with butter and flour.

Whisk together melted butter, brown sugar and 1/4 teaspoon salt. Add 1 cup flour and mix with a fork until it is moist. Put in the refrigerator.

Whisk together the remaining 3/4 cup flour, baking powder, and remaining 1/4 teaspoon salt. Set aside.

Using a mixer, beat softened butter, powdered sugar and vanilla until light and fluffy. Add the eggs one at a time. Beat well. Add the flour mixture slowly.

Spread batter evenly in the prepared pan. Sprinkle with blackberries. Top with the chilled topping. Bake 40-45 minutes. Cool completely in the pan, then remove and cut into squares.