Heat butter in a large nonstick pot over medium-low heat until fully melted.
Add 5.5 cups marshmallows and 1.5 cups chocolate chips.
Mix and cook until melted. It's okay if there are some lumps and it's not fully melted.
Add cereal and mix until fully coated.
Spoon mixture in a rectangle pan (Dimensions 9x13) that's lined with wax paper and sprayed with oil.
Spray the back of a spatula with oil and use it to press the mixture evenly in the pan.
Press the remaining ½ cup marshmallows and ½ cup chocolate chips on top.
Chill in the fridge for 1 hour until it becomes firm.
Remove from pan and use a sharp knife to cut slices. Enjoy!
