Start by gathering your ingredients. In a large mixing bowl, combine 6 cups of Krispie cereal, 1 cup of crushed Oreo cookies, and 1 cup of mini marshmallows.

In a medium saucepan over medium heat, melt 4 tablespoons of butter until it starts bubbling gently. Next, add in 8 cups of mini marshmallows along with a pinch of salt. Stir continuously for about 3-4 minutes until the marshmallows are fully melted and the mixture becomes smooth and glossy.

Once your butter and marshmallow mixture is ready, carefully pour it over the cereal and Oreo blend in the large mixing bowl. Gently fold the ingredients together using a spatula, making sure to coat everything evenly without crushing the cereal or Oreos.

Prepare a 9-inch square pan by greasing it lightly with butter or cooking spray. Pour the sticky mixture into the pan, and with a piece of parchment paper or your hands, press it down evenly to create a smooth and compact top.

Allow the packed Oreo Krispies to cool at room temperature for about 30 minutes. Once they’ve set and firmed up, take a sharp knife (greased for easier slicing) and cut them into squares.