Heat oven to 375°F. Place mini paper baking cup in each of 36 mini muffin cups.
In small bowl, mix graham cracker crumbs, sugar and 1/3 cup melted butter. Spoon 1 tablespoon mixture into each cup; press into cup with back of spoon.
Bake 7 minutes. Cool in pan 15 minutes, then remove cups to cooling rack.
In microwavable bowl, microwave chocolate chips and 2 tablespoons butter uncovered on High 1 minute, stirring every 30 seconds. If not melted, stir and reheat in 10-second intervals until melted.
Using a small cookie scoop, place a scoopful of marshmallow creme into each cup. Drizzle with melted chocolate mixture. Serve immediately, or refrigerate until serving.