In a large saucepan over low heat, melt the butter. Once melted, add in the mini marshmallows. Stir continuously until entirely melted and smooth.

Remove the pan from heat and immediately add the Rice Krispies, stirring well until they’re fully coated with the marshmallow mixture.

Fold the cherry pie filling and vanilla extract into the Rice Krispies mixture, being gentle to maintain the crunch.

Allow the mixture to cool slightly, then press it into a greased square pan. Use a spatula or wax paper to smooth the top.

If using, sprinkle cherry-flavored sprinkles on top before the mixture fully sets.

Let the mixture cool completely, then cut it into squares and serve.