Step 1

Line a 9x13-inch pan with foil and spray with nonstick cooking spray.

Step 2

Melt the butter in a large pot over medium low heat. Add the marshmallows and stir until melted. Remove from heat and stir in vanilla extract.

Step 3

Add cereal and stir to coat with the marshmallow mixture. Pour into pan. Press firmly to compact. Tip: spray wax paper with nonstick cooking spray so you can press without it sticking to your hands.

Step 4

Let set until firm then slice into bars. Store in an airtight container for up to 3 days.