• Yield: Makes one 9-by-13-inch Blondie

Source: Martha Stewart Kids, Spring 2006


  • 13 tablespoons unsalted butter, softened, plus more for pan
  • 2 1/2 cups all-purpose flour
  • 1 1/2 teaspoons baking powder
  • 3/4 teaspoon salt
  • 1 1/2 cups packed light-brown sugar
  • 3 large eggs
  • 1 1/2 teaspoons pure vanilla extract


  1. Preheat oven to 350 degrees. Butter 9-by-13-inch cake pan; line with parchment paper, allowing 2-inch overhang. Butter parchment. Whisk flour, baking powder, and salt in a medium bowl. Put butter and brown sugar into mixer bowl; mix on medium-high until pale and fluffy. Mix in eggs and vanilla. Reduce speed to low. Add flour mixture; mix until just combined.

  2. Spread batter into prepared dish; smooth top. Bake until a cake tester inserted into center comes out with only a few moist crumbs attached, 25 to 30 minutes. Let cool in dish 40 minutes. Lift out, and let cool completely on wire rack.


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