Preheat oven to 350℉. In a food processor pulse together Nilla wafers, peanuts and sugar until you have a course uniform crumb. Drizzle in melted butter and pulse a few times to combine. Using 8, 4" mini tart pans with removable bottoms add 1/4 cup of crumb mixture to tart pan and evenly spread over the bottom and up the sides, pressing lightly to compact. Place prepared tart shells on a large baking sheet and bake for 10 minutes. Remove and allow to cool at room temperature.