01 -
Warm your oven to 450°F and line two baking sheets with foil. Scatter Rice Krispies across one sheet and bake for 3-5 minutes. Stir them once per minute until they become golden and give off a nutty aroma.
02 -
Coat your second foil-lined sheet with cooking spray and spread marshmallows in a single layer. After your cereal cools, switch oven to broil. Brown the marshmallows for 30-60 seconds until golden on top. Don't leave them unattended.
03 -
In a big pot, melt butter over medium heat. Continue stirring for 5-7 minutes until it changes to gold and smells nutty. Turn down heat, add the marshmallows, and mix until smooth. Stir in vanilla.
04 -
Pour your browned cereal into the pot. With heat on low, gently fold until all cereal bits are covered with the marshmallow mix.
05 -
Pack the mixture into a greased 8x8 or 9x9 dish. Use a greased measuring cup to flatten the surface evenly. Add sea salt sprinkle if you want. Let cool fully before slicing into squares.