You should probably go make these now.
Thelma's Peanut Butter Bars (the new and improved vegan version)
2 sticks (1 cup) soy margarine, melted
2 cups graham cracker crumbs
1 cup chunky peanut butter
2-1/3 cups powdered sugar
12 oz. chocolate chips
Combine first four ingredients and mix until well incorporated. Spread into a greased 9" x 13" pan. Melt the chocolate chips and spread them over the top.
Cutting these nicely can be a bit of a challenge - obviously you don't want to do it while the chocolate is still soft, but if you wait until it's completely hardened, it has a tendency to kind of shatter when you try to cut them into nice-looking squares. I recommend either cutting them after a short while in the fridge (maybe 45 minutes or so? I didn't time mine...) or chilling them completely, but letting them sit out for a bit before you cut and serve them.