Melt white chocolate in a double boiler. Stir in peanut butter. Spread on foil lined cookie sheet or small brownie pan (which works better)
Melt chocolate chips (add a small amount of milk if chocolate is hard to melt) in double boiler and dribble, in swirls, on top of the white chocolate. Take a knife or toothpick and swirl the chips in to make it look like tiger stripes. Set in refrigerator until hard and break or cut into squares.