In the microwave or a saucepan, heat peanut butter, honey, and vanilla extract together until easily combined and warm.
Add the rice cereal and any add-ins (cacao nibs, mini chocolate chips) into the peanut butter mixture.
Wet your hands and roll the mixture into balls slightly smaller than golf balls. You may need to rewet your hands each time you roll a new ball, and slightly crunch the ball into your palm so it sticks to itself.
Freeze the balls for 10 minutes and eat straight from the freezer.
Recipe by Uproot Kitchen at https://uprootkitchen.com/2014/07/07/crispy-peanut-butter-balls/