Gooey Oreo Bars

1 package Oreo cookies
4 tbsp butter
1 bag mini marshmallows

Use a food processor to finely crush the Oreo cookies.
Melt the butter in a large pan.
Spray a rubber spatula with cooking spray and pour the marshmallows in with the melted butter. Melt over medium heat, using the spatula to stir the marshmallows until they are fully melted.
Remove the pan from heat and stir in the crushed Oreos, mixing until fully combined.
Line a 13x9 inch pan with parchment paper, and coat with cooking spray. Pour the Oreo mixture into the pan, and allow to cool.
Cut into bars.