01 -
Let the butter melt in a big saucepan over medium heat. Toss in the peanut butter and stir it all together until it's fully mixed.
02 -
Throw in the mini marshmallows, stirring the whole time until the mixture turns silky. Take the pan off the stove.
03 -
Add the crispy rice cereal and stir well so everything gets coated evenly.
04 -
Carefully fold in the halved peanut butter cups, being gentle so they don't smoosh.
05 -
Grease a 9x13-inch dish lightly, then press the mixture down inside until it's flat.
06 -
Wait for it to cool at room temperature. If you’d like, drizzle melted chocolate on top, then slice it into squares and enjoy.