
Combine 1 1/2 cups sugar, 6 tablespoons butter, and 1/3 cup evaporated milk in a medium size saucepan; bring to a full boil, stirring constantly. Continue boiling for 4 minutes over medium heat, stirring constantly.
Remove from heat; stir in chocolate chips until melted. Add 1 cup (1/2 jar) marshmallow creme and 1/2 teaspoon vanilla. Stir until well blended.
Pour into 9 x 13 inch pan.
Repeat with remaining ingredients, substituting peanut butter for chocolate chips. Pour and spread over the chocolate layer. Cool at room temperature, and cut into squares.