Ingredients
3 tablespoons unsalted butter, plus more softened for pan
1 10-ounce bag mini marshmallows
1 recipe mix-ins (see below)
5 cups chocolate puffed rice cereal, such as Cocoa Krispies
1 cup cocktail peanuts, roughly chopped
1/2 cup chopped semisweet chocolate
5 cups puffed oat cereal, such as Puffins
1/2 cup dried cherries or cranberries
1/2 cup chopped toasted pecans
1/2 cup toasted pepitas
5 cups flaked corn cereal, such as Corn Flakes
1/2 cup chopped dried tropical fruit, such as mango and/or pineapple
1/2 cup toasted coconut flakes
1/2 cup chopped macadamia nuts
5 cups whole-grain oat cereal, such as Cheerios
3/4 cup chopped freeze-dried raspberries
3/4 cup chopped white chocolate
Preparation
Grease a 9-inch square baking pan with softened butter. Melt 3 tablespoons butter in a large pot over medium heat. Add marshmallows; cook, stirring, until melted. Remove from heat.
Stir in cereal and chosen mix-ins to combine. Press into prepared pan; let stand until firm, about 1 hour. Cut into squares and serve, or store in an airtight container at room temperature up to 3 days.