Created by KittenCal on November 2, 2011
Step 1: Light grease a 13 x 9-inch pan (can use an 11 x 7-inch pan for higher bars).
Step 2: In a large plastic or microwave-safe bowl melt butter, marshmallows and peanut butter on HIGH in the microwave until completely melted (about 2 minutes).
Step 3: Add in vanilla then immediately stir vigorously until smooth and combined (this may take a couple of minutes).
Step 4: Using a wooden spoon mix in cereal until well combined (this will take a couple of minutes).
Step 5: Transfer to pan, then using wet hands press evenly into the pan; cool then cut into squares (store in refrigerator or freeze)