In a large pot, melt butter over medium heat. Add in bag of regular mini marshmallows, reduce heat to low. Stirring constantly, melt marshmallows completely. Remove from heat. Add in vanilla extract.
Fold in Rice Krispies cereal. Carefully fold in peppermint marshmallows.
Press gently into a parchment paper lined 9-inch square baking dish. Allow to set, about 1 hour.
Cut into small squares. If desired, dip bottoms of each square into melted white chocolate, or drizzle over the top. Set onto a piece of parchment paper and allow to set (about 15 minutes). Enjoy!
Notes
These treats are perfect for holidays or any time you want a festive twist on a classic.