In a microwave-safe bowl, combine the peanut butter and honey. Heat for 20-30 seconds until softened, then stir until smooth and creamy.

Add the vanilla protein powder to the warm mixture and fold it in to form a thick dough. If too dry, add a teaspoon of milk or water.

Gently fold in the rainbow sprinkles, ensuring even distribution without over-mixing.

Portion out the mixture and roll it into bite-sized balls, about 1 inch in diameter.

Roll each ball in additional sprinkles for extra visual appeal.

Refrigerate the tray of protein balls for at least 20 minutes to firm up before enjoying.