April 8th, 2012
From the book Sticky, Chewy, Messy, Gooey Treats for Kids by Jill O'Connor. Photography by Leigh Beisch. Published by Chronicle Books San Francisco. Reprinted with permission of the publisher.
Preheat the oven to 350 degrees F. Coat a 9x13 inch baking pan with nonstick cooking spray.
To prepare the crumble
In a medium bowl, stir together the 2 cups brown sugar, 2 1/4 cups flour, 1 teaspoon cinnamon, and 1/4 teaspoon salt until well combined. Add the 1 cup (2 sticks) melted butter and stir with a fork until the butter is completely combined and the mixture forms large, moist, clumps. Set aside.
To prepare the batter
In a large bowl, beat the 3/4 cup (1.5 sticks) butter and s1 cup ugar together with a hand mixer set at medium-high speed until light and fluffy, 3 to 4 minutes. Add the 2 large eggs, one at a time, beating just until well combined. Beat in the 2 teaspoons vanilla and 1 cup sour cream sour cream. Sift together the 2 cups flour, 1 1/4 teaspoons baking powder, 1/2 teaspoon baking soda, and 34 teaspoon salt. Fold the flour mixture into the batter by hand using a large rubber spatula.
Spread the batter evenly into the prepared pan. Use your hands to sprinkle the crumble over the batter, making sure some of the larger clumps remain as you go. Cover the batter completely with crumble.
Bake until a skewer inserted into the center of the cake comes out clean, and the crumble is slightly crisp, 30 to 35 minutes. Let cool on a wire rack for 10 to 15 minutes. Sprinkle with confectioners sugar, cut into 15 squares, and serve.