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Heat oven to 350°F Grease a 13x9-inch pan with nonstick cooking spray.
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In a medium bowl, using wire whisk stir together flour, baking powder, and salt; set aside.
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In a large bowl, with a wire whisk, mix together melted butter, sugar and vanilla. Beat eggs, one at a time, using a wooden spoon, stir in flour mixture until well blended.
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Separate half the batter (about 1 1/2 cups) to medium bowl. Mix in peanut butter. Stir in chocolate morsels and spread batter evenly in pan.
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Add cocoa to remaining batter; mix well, Srir in peanuts, Spoon chocolate batter over peanut butter layer and smooth top gently.
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Bake 25-30 minutes, until a toothpick inserted in the center comes out clean.
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Cool in pan on wire rack, Cut into 24 squares.