Prepare three 8" pans with non-stick cooking spray and set aside.
Put Rice Krispy Cereal in a large bowl and set aside
In a large pot, melt butter and mini marshmallows on medium heat. Make sure you stir every 15-30 seconds until everything is melted.
Mix in vanilla.
Add a few drops of pink food coloring and mix until color is even. If you want more color, repeat this step until you get desired color.
Add marshmallow mixture to Krispy cereal and mix until everything is coated evenly.
Divide the mix evenly between the three cake pans. Spray your hands with non-stick cooking spray and press down until the layers are tightly packed and have an even top.
Place in the refrigerator for at least 30 minutes. Once cooled, use an offset spatula to remove the layers from the pans and decorate.