0 Melt 10 oz of small marshmallows and 2 tablespoons of salted butter in a large microwave-safe bowl in 45-second increments.
1 Stir the mixture every 45 seconds until completely melted.
2 Stir in 10 oz of Lucky Charms cereal.
3 Mix until all of the cereal is thoroughly coated in melted marshmallows.
4 Pour the mixture into a 9x13 baking pan lined with parchment paper.
5 Press the mixture into the pan using a silicone spatula.
8 Add extra cereal or rainbow sprinkles on top.
6 Allow treats to cool for at least 2 hours.
7 Cut into squares using a butter knife.
