In a large bowl, combine graham cracker crumbs with 1/3 cup melted butter, 1/4 cup melted creamy peanut butter, and 3 tablespoons granulated sugar. Stir to combine.
Line a mini muffin tin with paper liners. Scoop 1 tablespoon of the graham cracker mixture into each liner. You should have enough mixture for 24 mini bites.
Use the back of a spoon to firmly press the mixture into the liner. You want to press as hard as you can so that the S’mores bites don’t crumble.
Place in the oven for about 7-8 minutes.
Allow the Peanut Butter S’mores Bites to cool for about 15 minutes, then remove them from the pan and place on a wire rack to cool for an additional 10-15 minutes.
Scoop 1 tablespoon marshmallow creme on each bite.
In a small bowl combine 1/3 cup milk chocolate chips with 2 tablespoons butter. Melt either in the microwave for about 1 minute (stir at the 30 second mark) or using a double boiler. When the mixture is melted and well combined, pour the mixture into a plastic ziplock bag. Snip a small section off the corner of the bag and drizzle the chocolate mixture over each Peanut Butter S’mores Bites.