Line an 8x8 square baking pan with parchment or waxed paper, both bottom and sides.
Melt the white chocolate chips in a microwave (for 30 seconds at a time) or in a double boiler. Stir until chocolate is all melted. Mix in the peanut butter until homogeneous. Add food coloring till desired color is achieved.
Spread peanut butter fudge into your prepared pan and refrigerate for at least 15 minutes before the next step.
Melt the dark chocolate chips with the cream in a microwave (for 30 seconds at a time) or in a double boiler. Stir until chocolate is melted and homogeneous.
Pour over peanut butter fudge and smooth over the top. Chill for at least 3 hours or until firm. Cut into small squares or tombstones for Halloween.