Ingredients
4 (1-oz.) unsweetened chocolate baking squares
3/4 cup butter
1 1/2 cups granulated sugar
1/2 cup firmly packed brown sugar
3 large eggs
1 cup all-purpose flour
1 teaspoon vanilla extract
1/8 teaspoon salt
1/2 cup all-purpose flour
2 tablespoons light brown sugar
2 tablespoons granulated sugar
1/3 cup chunky peanut butter
2 tablespoons melted butter
1/8 teaspoon salt
Preparation
1. Preheat oven to 350°. Line bottom and sides of an 8-inch pan with aluminum foil, allowing 2 to 3 inches to extend over sides; lightly grease foil.
2. Microwave chocolate squares and 3/4 cup butter in a large microwave-safe bowl at HIGH 1 1/2 to 2 minutes or until melted and smooth, stirring at 30-second intervals. Whisk in 1 1/2 cups granulated and 1/2 cup brown sugars. Add eggs, 1 at a time, whisking just until blended after each addition. Whisk in 1 cup flour, vanilla, and 1/8 teaspoon salt.
3. Pour mixture into prepared pan.
4. Stir together 1/2 cup flour, 2 Tbsp. brown sugar, 2 Tbsp. granulated sugar, peanut butter, 2 Tbsp. melted butter, and 1/8 tsp. salt until blended and crumbly. Sprinkle peanut butter mixture over batter.