Prepare 9 x 13" pan with parchment and non-cooking spray.
In a large pot, melt butter and mini marshmallows on medium heat. Make sure you stir every 15-30 seconds until the two ingredients are combined.
Add in Rice Krispy cereal and mix until everything is coated in the marshmallow mixture.
Pour Krispy mixture into prepared pan. Spray PAM on your hands and press mixture down into the pan until it is one even layer.
Place in the fridge for at least 30 minutes.
Once treats have cooled, take them out of the pan and use the heart cookie cutter to cut out individual hearts.
In a microwave safe bowl, melt chocolate in 30 second increments, stirring between each heating. Once melted, divide into three bowls and color chocolate desired colors.
Dip heart into chocolate and add sprinkles.
Stick in a lollipop stick in the bottom and set on parchment paper to dry.