01 -
Freeze your M&Ms for at least 30 minutes before using to prevent them from melting when added to the warm mixture.
02 -
In a large pot over medium heat, melt the butter and brown it. Stir continuously for 8-10 minutes until it develops a rich nutty smell and a deep amber color.
03 -
Set aside 3 cups of marshmallows. Add the remaining marshmallows to the browned butter and stir until completely melted and smooth. Remove from heat.
04 -
Mix in the vanilla extract, salt, and marshmallow fluff until mostly smooth.
05 -
Mix the melted marshmallow mixture with the Rice Krispies cereal, mini marshmallows, and 2 cups of M&Ms in the pot or a large mixing bowl. Reserve ¼ to ½ cup of M&Ms for topping.
06 -
Grease a 9x13-inch pan or line it with parchment paper. Pour the mixture into the pan. Grease your hands with butter or nonstick spray and press the mixture gently and evenly.
07 -
Top with the reserved M&Ms, mini chocolate chips, and flaky sea salt. Allow to cool for 30-60 minutes before slicing.