Lightly coat a 9 inch cast iron skillet or 9" round cake pan with cooking spray.
In a large bowl, whisk together the flour, baking soda, and salt. Stir in the oats. Set aside.
In another large bowl, whisk together the melted butter, brown sugar, and granulated sugar until smooth. Add peanut butter and mix until incorporated. Whisk in egg and vanilla until smooth and combined.
Slowly stir in dry ingredients to the wet ingredients and mix until just combined. Be careful not to over-mix.
Fold in peanut butter chips and half of the Reese's pieces and peanut butter cups - reserving the other half for topping.
Gently press cookie dough into prepared skillet and top with reserved Reese's pieces and peanut butter cups evenly.
Bake 22-27 minutes or until an inserted toothpick comes out clean.
Serve warm, with vanilla ice cream.
Reese's Peanut Butter Oatmeal Skillet Cookie
Amount Per Serving (1 serving (1/10 recipe))
Calories 467Calories from Fat 252
% Daily Value*
Saturated Fat 13g65%
Vitamin A 460IU9%
* Nutrition facts are provided as a courtesy using the WPRM recipe calculator. It is best to make your own calculations to ensure accuracy. We expressly disclaim any and all liability of any kind with respect to any act or omission wholly or in part in reliance on anything contained in this website. Percent Daily Values are based on a 2000 calorie diet.