In a food processor or high-speed blender, combine frozen banana slices, peanut butter, and 1/4 cup almond milk. Blend until smooth. If it’s too thick, add a splash more almond milk.
Add mini peanut butter cups and pulse to mix.
Enjoy immediately for a soft-serve texture, or transfer to a parchment-lined bread pan and freeze for about 2 hours for a firmer, ice cream-like consistency. If left in the freezer longer, it will become solid, so remember to thaw before serving!
Serve with additional peanut butter cups and a drizzle of peanut butter.