Prepare your workspace by gathering ingredients and tools: a large mixing bowl, saucepan, and parchment-lined baking sheet.
In a saucepan over low heat, melt the butter and mini marshmallows until smooth, stirring frequently.
Remove from heat and mix in the peanut butter until fully combined.
Pour the melted mixture over the Rice Krispies in a large bowl and gently combine until evenly coated.
Using wet hands to prevent stickiness, roll small portions into balls about one inch in diameter and place on the baking sheet.
Refrigerate for at least 30 minutes to set before enjoying.
