Melt the butter. Grab a large saucepan, toss in the butter, and melt it over low-medium heat. Don’t burn it unless you’re into charcoal-flavored treats.
Add marshmallows. Stir constantly until they melt into a smooth, sticky, gooey dream. If you sneak a finger taste, I won’t judge.
Mix in the cereal. Remove the pan from heat, pour in Rice Krispies, and stir until every flake is coated in marshmallow magic.
Press into a pan. Grease an 8×8-inch pan lightly and press the mixture in evenly. Tip: use a buttered spatula or wax paper to avoid sticky fingers.
Cool & slice. Let it rest for 10–15 minutes, then cut into squares. Warning: the aroma may tempt you to eat a corner first.