makes about 32 squares
3 tablespoons unsalted butter
1 package (10 ounces) miniature marshmallows
6 cups crispy rice cereal
2 tablespoons red, white, and blue sprinkles (plus additional for sprinkling on top)
1. Melt the butter in a large microwave-safe bowl (30-45 seconds).
2. Add the marshmallows to the bowl and toss to coat in the butter. Microwave for 45 seconds, then stir. Microwave for an additional 30-45 minutes, or until melted. Stir until the mixture is smooth.
3. Stir in the crispy rice cereal and sprinkles.
4. Spray a 9x13 baking dish with cooking spray (or grease with butter). Press the marshmallow-rice mixture into the dish, forming an even layer. Top with a few more sprinkles, and then lightly press to help them adhere. Let cool completely before cutting into squares.