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1
Heat oven to 350.
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2
Grease rectangle pan, 13 x 9 x 2 inches.
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3
Mix granulated and brown sugar with egg, margarine or butter and peanut butter in a large bowl.
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4
Stir in flour, oats, baking soda and salt.
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5
Spread in pan.
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6
Bake until golden brown, 17-22 minutes; cool.
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7
Prepare Peanut Butter Frosting combining 1 1/2 cups confectioners sugar, 1/4 cup peanut butter and 2-3 tbls.
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8
milk until smooth; reserve 1/3 cup.
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9
To remaining frosting, stir in cocoa powder and additional 1-2 tbls.
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10
milk until smooth and spreading consistency.
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11
Frost squares with cocoa frosting.
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12
Drop peanut butter frosting by teaspoonfuls onto cocoa frosting swirling for marbled effect.
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13
Cut into 16 squares.
