Add Jet Puffed Marshmallows and stir until completely melted. Remove from heat.
Add KELLOGG'S® COCOA KRISPIES® cereal. Stir until well coated.
Using buttered spatula or wax paper evenly press mixture into 13 x 9 x 2-inch pan coated with cooking spray. I like to use butter instead of spray, because butter makes everything better!
Cool. Cut into 2-inch squares. Best if served the same day.