Peanut butter marbled brownies

Peanut butter filling:
6 oz. cream cheese, softened
1/2 c. peanut butter
1/4 c. sugar
1 egg
2 Tbsp. milk

Mix until smooth and creamy

Brownies:
1 c. butter, melted
2 c. sugar
2 tsp. vanilla extract
3 eggs
3/4 c. cocoa powder
1 1/4 c. all purpose flour
1/2 tsp. baking powder
1/4 tsp. salt
1 c. milk chocolate chips

Heat oven to 350 degrees. Grease 13X9X2 pan. Prepare peanut butter filling. Stir together melted butter, sugar and vanilla. Add eggs and beat well. Add cocoa and beat until well blended. Add flour, baking powder, and salt; beat well. Stir in chips. Remove 1 c. batter. Pour remaing batter into preparede pan. Spread filling over surface. Drop reserved chocolate batter by teaspoonfuls over filling. Using knife, genly swirl for marbled effect. Bake for 35 to 40 minutes or unti lwooden pick insered in center comes out clean.