From Minna: No-Bake Chocolate Peanut Butter Bars

in case you missed it:

No-Bake Chocolate Peanut Butter Bars

Makes about 24
1 cup butter or margarine, melted
2 cups graham cracker crumbs
2 cups powdered sugar
1 cup peanut butter, crunchy or smooth
1-1/2 cups semisweet chocolate chips
4 tablespoons peanut butter
In a medium mixing bowl, stir together butter or margarine, graham cracker crumbs, powdered sugar and 1 cup peanut butter until well blended. Press into the bottom of an ungreased 9 x 13" baking pan. In the top of a double boiler over hot (not boiling) water, melt the chocolate chips with the 4 tablespoons peanut butter, stirring occasionally until smooth. Spread on top of the mixture in the baking pan. Refrigerate for about 1 hour before cutting into bars.

Note: Yield depends on how big or small you cut the bars/squares. That's the recipe I use, but I never follow this recipe to the letter: I usually have to use something else but graham crackers, I use a bit more chocolate and it never comes in chips, and instead of peanut butter I mix cream to the chocolate.