Spray a 9x13 inch baking dish with nonstick baking spray.
Melt the butter in a large pot over medium heat. Continue to cook it without stirring, watching it constantly, until brown bits begin to form on the bottom. Reduce the heat to low and stir in 15 ounces of the marshmallows. Stir in the peanut butter.
Stir the mixture with a spatula continuously until the marshmallows and peanut butter melt completely. Stir in the vanilla extract.
Pour in the cereal. Stir until it’s about halfway mixed, then stir in the remaining marshmallows. Mix until the marshmallows are evenly distributed.
Press the mixture into the 9x13 dish. Sprinkle the top with flaky salt. Let the bars set and cool for 30 minutes before cutting. Slice them as small or as large as you’d like.
Course: Dessert
Cuisine: American
Author: How Sweet Eats
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