Spray with nonstick cooking spray a 9x13 baking dish- set aside.
In a medium pan over medium low heat melt butter. (3 tbs butter)
Add in marshmallows. Stir until fully melted. (10 oz marshmallows)
Once fully melted, remove from heat and stir in the Fruit Loops. Make sure to stir the marshmallows and cereal together really well or else you will get a marshmallow layer on the bottom of the pan and it’s not and tasty as you might think. (6 cups)
Press the cereal into prepared 9x13 baking dish. Use a spatula sprayed with non-stick cooking spray to firmly pack the cereal into the pan.
Let the fruit loop cereal treat cool completely and then cut into 18 squares.