Cookies and Cream Rice Krispies Treats

4 tablespoons butter
4 cups miniature marshmallows
8 cups rice crispy cereal
1 (8 ounce) bag mini Oreo cookies
1/2 cup chocolate chips, melted

Place butter and marshmallows into a large microwavable bowl. Microwave for a few minutes until marshmallows puff up nice and large. Remove and stir in cereal and Oreos. Pour into a large 9 x 13-inch baking dish. With the back of a large spoon that has been sprayed with cooking spray, press and smooth treats. Drizzle melted chocolate over top and let cool. Cut into squares.