Here’s How 1. Melt butter in a microwave safe bowl for 10 seconds. May need more time depending on your microwave but increase time slowly. once melted, 2. Place marshmallows in the same bowl and microwave again for about twenty seconds. 3. The marshmallows will start expanding so keep an eye on them that they don’t come over the edge of the bowl. 4. Remove the bowl from the microwave, they will deflate again. 5. Stir melted butter and marshmallows together until smooth paste is formed 6. Pour in Rice Krispies cereal and stir until well blended. 7. Eat straight from the bowl, or take out in a plate. Once cool, you can enjoy Helpful Notes Watch carefully when melting butter and marshmallows. Melting time varies depending on your microwave speed.