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In a microwave safe bowl, add 4 cups of mini marshmallows and 3 tablespoons of butter. Microwave for a minute, or until the marshmallows puff up. Remove from microwave and stir.
In another bowl, toss together the Rice Krispies, graham cracker crumbs and oats. Pour this mixture into the melted marshmallows and butter. Stir until thoroughly combined.
Let the mix start to cool. Then gently fold in the remaining mini marshmallows and the chocolate chips.
Spoon the entire mixture into a baking dish coated with nonstick spray. Let set for at least an hour prior to cutting into bars.