1. Melt together the chocolate and coconut oil (if using) in the microwave. Mix in the peanut butter, brown rice krispies, pretzels and M&M's.2. Scoop a spoonful (1 tablespoon or so) out onto a parchment-lined baking sheet. Chill 10 minutes in the fridge or freezer, until set. 3. Keep stored in the fridge or at room temperature.