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box (1 lb 2.4 oz) Betty Crocker® Original Supreme Premium brownie mix
Water, vegetable oil and egg called for on brownie mix box
1/3 cup packed brown sugar
1/3 cup crunchy peanut butter
1 egg
2/3 cup Betty Crocker® Rich & Creamy vanilla frosting (from 16 oz container)
1/4 cup peanut butter
1 to 2 teaspoons milk
Heat oven to 325°F. Grease bottom only of 9-inch square pan with shortening or cooking spray. Make brownie batter as directed on box. Spread 3/4 of brownie batter in pan. Set remaining batter aside.
In small bowl, mix brown sugar, 1/3 cup peanut butter and 1 egg. Spoon peanut butter mixture by tablespoonfuls evenly onto brownie batter. Top with random tablespoonfuls of remaining brownie batter. Cut through batter several times with knife for marbled design.
Bake 40 to 45 minutes or until toothpick inserted 2 inches from side of pan comes out clean or almost clean. Cool completely, about 1 1/2 hours.
In medium bowl, mix all frosting ingredients, using spoon, until smooth and spreadable. Spread frosting over brownies. For brownies, cut into 5 rows by 4 rows. Store tightly covered.
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