1. Spray three 9x13 pans with cooking spray.

2. Pour all rice crispy cereal into a very large bowl. Make sure there's enough room to stir in marshmallows.

3. Place oil in a large pan on the stove over low-medium heat.

4. As soon as oil melts pour in marshmallows.

5. Stir continually until marshmallows melt and are runny.

6. Pour melted marshmallows over cereal and stir until combined.

7. Scrape into oiled 9x13 pans.

8. Press down lightly to even them out with a piece of wax paper or parchment paper and your hand. *Be careful not to press down too much as you want them to stay light and fluffy, not firm and condensed.