Cream Butter, Brown Sugar, Sugar, Eggs And Vanilla Until Light And Fluffy. Combine Flour, Baking Soda And Salt; Add To Creamed Mixture. Combine Milk Chocolate Chips And Peanut Butter Chips; Stir Into Batter. Spread Mixture Evenly Into Greased 15 X 10 X 1 Jelly Roll Pan. Bake At 350 Deg F For 20 To 25 Minutes Or Until Golden Brown. Cool In Pan. Cut Into Squares When Cool.