In a large pot, melt butter and marshmallows over low heat until smooth. Stir in vanilla extract.
Remove pot from heat and stir in the cereal, 2 cups at a time.
Use a spatula to scrape mixture into a lightly greased 8x8 or 9x9 baking dish. Rub a little butter or oil on your hands and use them to lightly press the mixture flat.
Let cool 30 minutes then cut into squares or shapes.
Recipe by Eating Made Easy at https://eating-made-easy.com/naturally-pink-rice-crispy-treats-for-valentines-day/