M&M Skillet Cookie with Homemade Hot Fudge Sauce

Course: Dessert
Cuisine: American
Keyword: cookie cake, hot fudge sauce, M&M cookies, M&Ms, skillet cookie
Dessert Type: Bar cookies, Cookies
Prep Time: 10 minutes
Cook Time: 30 minutes
Total Time: 40 minutes
Servings: 12
Calories: 246kcal
Author: Elizabeth LaBau
When a normal cookie just won't do, you need this giant M&M Skillet Cookie! It fills an entire cast iron skillet and is perfect for serving in large slices with ice cream and homemade hot fudge on top.
Print Recipe


  • 1 1/3 cup all-purpose flour
  • 1/2 tsp baking powder
  • 1/4 tsp baking soda
  • 1/4 tsp salt
  • 5 1/2 ounces butter 11 tbsp, softened to room temperature
  • 1 cup packed brown sugar
  • 1/3 cup granulated sugar
  • 1 egg room temperature
  • 1 egg yolk room temperature
  • 1 tsp vanilla extract
  • 1 cup of M&Ms
  • 2 cups assorted mix-ins I used a mix of chopped walnuts, toffee bits, and shredded coconut. You could use other nuts, candies, or chocolate chips as well


  • Preheat the oven to 350 degrees Fahrenheit. Butter or spray a 10-inch skillet or cake pan. In a small bowl, whisk together the flour, baking powder, baking soda, and salt, and set aside for now.
  • In a large mixing bowl, cream together the butter and both sugars on medium-high speed, until light and fluffy, about 3 minutes. Add the egg and the egg yolk, and mix for an additional minute, until the egg is full incorporated. Add the vanilla extract and mix it in.
  • With the mixer on slow speed, add the dry ingredients and mix only until the flour is mostly incorporated—stop the mixer when you still have a few streaks left. Add the M&Ms and the rest of your mix-ins, and stir everything together by hand. Be sure to scrape the bottom and sides of the bowl well with the spatula to incorporate any last pockets of butter or flour.
  • Scrape the dough out into the prepared pan and spread it into an even layer. Bake the skillet cookie at 350 F for 25-30 minutes. You may want to cover it in the last 5 minutes to prevent it from getting to brown on top. Use a toothpick to make sure it’s cooked in the center, then let it rest at room temperature until it’s barely warm. Serve in slices with whipped cream, ice cream, or fudge sauce.


Calories: 246kcal | Carbohydrates: 34g | Protein: 2g | Fat: 11g | Saturated Fat: 6g | Cholesterol: 57mg | Sodium: 179mg | Potassium: 68mg | Sugar: 23g | Vitamin A: 365IU | Calcium: 33mg | Iron: 0.9mg