Nutty Peanut Butter Pudding Bars

1 (12 ounce) package chocolate chips
1 (12 ounce) package butterscotch chips
1 ounce unsweetened chocolate
1 (12 ounce) jar peanut butter
1 cup butter or margarine
1/3 cup canned milk
5 tablespoons regular vanilla pudding mix
2 pound confectioners sugar, sifted
1 1/2 cups chopped peanuts

Melt chocolate chips, butterscotch chips, unsweetened chocolate and peanut butter in a double boiler. Put 1/2 of mixture into a buttered 10 x 15-inch pan. Reserve other half at room temperature. Put pan in refrigerator to cool.Heat butter, milk and pudding mix until melted and mixed together. Pour this into a mixing bowl and add confectioners sugar and mix well. Use this mixture to frost the refrigerated pan of chocolate.Sprinkle peanuts over confectioners sugar mixture and spread remaining chocolate mixture on top of the peanuts. Refrigerate until firm.