Step 1

Add rice cereal and 3 cups marshmallows to a large mixing bowl; set aside.

Step 2

Line a 13x9 baking pan with aluminum foil or parchment paper then rub with butter (can spray with cooking spray too); set aside. This step is optional - it just makes things easier to cut and remove from pan.

Step 3

Melt butter over low heat in a large pot. Once butter is melted, add remaining marshmallows, vanilla and salt. Cook and stir over low heat until marshmallows are completely melted.

Step 4

Pour marshmallow mixture into bowl with cereal and marshmallows then gently stir until cereal is evenly coated.

Step 5

Spread mixture evenly into prepared pan. Using a rubber spatula or the bottom of a second pan, press the mixture into the pan. Let treats cool to room temperature uncovered.

Step 6

Once set, remove from pan by lifting up on the aluminum foil then cut into squares. Store in an air-tight container.

Step 7

Consider adding sprinkles for seasonal treats or just for fun!