Don't worry about having room in your pantry to store these babies... with a combination of ooey gooey marshmallows, rich dark chocolate, and lip smackin peanut butter, they won't last long!
Prepare by buttering a 9" x 13" pan and chopping up dark chocolate Reese's peanut butter cups into quarters until you have 1 cup. Set aside. (If you can't find dark chocolate Reese's, feel free to use the original ones, I won't tell.)
Then, begin by melting 6 tablespoons of butter over low heat in a large pot and adding 2 packages of marshmallows (10.5 oz bags) to the melted butter. Stir until all of the marshmallows are melted.
Stir in up to 1 cup of dark chocolate peanut butter (again, if you can't find dark chocolate, regular will do), 1-1/2 teaspoons of vanilla extract, and 1/4 teaspoon of salt. Mix well. Add in 8 cups of Rice Krispies, about one cup at a time, and stir until they are evenly coated.