Heat oven to 350°F Greas a 13x9x2-inch baking pan.
Beat butter and peanut butter in large bowl. Add granulated sugar and brown sugar; beat well. Add eggs, one at a time, beating well after each addition. Blend in vanilla.
Stir together flour, baking powder and salt; mix into peanut butter mixture, blending well. Stir in peanut butter chips. Spread half of butter in prepared pan; spoon syrup over top. Carefully top with remaining batter; swirl with metal spatula or knife for marbled effect.
Bake 35 to 40 minutes or until lightly browned. Cool completely in pan or on wire rack. Cut into squares. About 36 brownies.
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Double Peanut Butter Paisley Brownies (cont.)