Skillet Monster Cookie

Serve this Skillet Monster Cookie warm with scoops of ice cream on top. It’s crisp on the edges and chewy in the center with brown sugar, oats.

This is a great family-style dessert that’s easy to make and will feed about 10 hungry people. My favorite way to serve it is as pictured. Top with ice cream scoops and then give everyone a fork. Somehow the cookie tastes even better when everyone is standing around the stove top, hovering over the skillet for a bite. The cookie also slices neatly into triangles, and it goes without saying that people with better manners could serve it on plates at the dinner table.

The combination of warm peanut butter-oatmeal cookie with melting vanilla ice cream on top is seriously amazing. The cast iron skillet gives the cookie chewy edges while the center remains soft, but if you don’t have a cast iron skillet a 10-inch round cake pan will work just fine.

Make the monster cookie dough.

Butter, peanut butter and sugars are heated on the stove top briefly to create a melted batter that is poured over oats and flour. This base cookie mixture is easy enough to stir together by hand using a rubber spatula. Fold in the chips, nuts and candy and then pack it into a well-greased 10-inch skillet.

Golden brown goodness.

The cookie is pretty darn good-looking straight from the oven, if you ask me. At this stage (and after cooling completely) it could be cut into pizza-style slices and individually packaged for take-aways or bake sales. It’s a very hearty cookie, so I could see it doing quite well on a bake sale table!

I wouldn’t hesitate to bring this to a potluck with a tub of ice cream on the side. I can also imagine a cute version with sprinkles and candles on top for a birthday cake alternative!

If you’re more inclined to skip the skillet and make a batch of monster cookies, you can check out my recipe here.

Skillet Monster Cookie

Heather Baird
This is a great family-style dessert that’s easy to make and will feed about 10 hungry people. My favorite way to serve it is as pictured: plop ice cream scoops on top and then give everyone a fork.
5 from 1 vote
Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Course Dessert
Cuisine American
Servings 10


  • 10 inch cast iron skillet


  • 1/2 cup unsalted butter
  • 1 cup creamy peanut butter
  • 1 cup light brown sugar, lightly packed
  • 1/2 cup granulated sugar
  • 2 eggs
  • 1 teaspoon vanilla extract
  • 2 cups old fashioned rolled oats
  • 1 cup all-purpose flour
  • 1 teaspoon baking powder
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1/2 cup candy-coated chocolates
  • 1 cup semisweet chocolate chips
  • 1/2 cup dry-roasted salted peanuts, chopped
  • Ice cream for serving


  • Preheat the oven to 350°F. Generously coat a 10-inch cast iron skillet with cooking spray. If you don’t have a cast iron skillet, grease a 10-inch round cake pan.
  • In a medium saucepan, combine the butter, peanut butter and sugars. Heat over medium-low heat until the butter and peanut butter are melted and the mixture can be stirred smooth. Do not boil. The mixture should be pourable and grainy from the sugar. Remove from heat and let cool until just warm. Whisk in the eggs and vanilla extract.
  • In a separate large bowl, combine the oats, flour, baking powder, baking soda and salt. Mix well. Pour the melted peanut butter mixture over the oat mixture. Using a rubber spatula, stir the mixture together, folding it together until no pockets of flour remain. Once the dough is consistent, add the candy-coated chocolates, chips and peanuts. Mix until well dispersed. Press dough into the pan evenly using a rubber spatula.
  • Bake for 25-30 minutes, or until the cookie is puffed and slightly brown on top. Remove from oven and let cool slightly. Serve slices warm with scoops of ice cream on top.
Keyword dry roasted salted peanuts, m&m candies, oats
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5 years ago

I want to try this one for a party in a couple of weeks!

The Italian Next Door
The Italian Next Door
5 years ago

This looks delicious! I like the thought of baking it in individual mini cast-iron skillets. Have you tried that and, if so, how many would it serve? I was thinking 8?? How long would the baking time be?

5 years ago

Looks absolutely delicious! I love skillet cookies!

The Italian Next Door
The Italian Next Door
5 years ago

Hi there! I'm wanting to try this with individual little cast iron skillets… cute! I'm thinking the recipe would make 8?? Have you tried doing that? I'm wondering what the bake time would be. Thanks!!

Heather Baird
Heather Baird
5 years ago

Hi Joann! I have not tried this recipe in mini pans, but I think that's the cutest idea ever. I believe you are right on the money if using the 3.5-inch minis. I think you'd get about 8 individual servings. I'd set the timer at 10 minutes, and keep an eye on the cookies as they bake. I suspect total bake time will be 15 minutes, but it's hard to say for sure.

Kate Sullivan
Kate Sullivan
5 years ago

I made these for last weekend. Huge Hit! Definitely a keeper!

5 years ago

We made this for Father's Day! It was a huge family hit and my husband says it's his new favorite cookie! Thank you for the post! I left out some M&M's from the batter and gave the kids some to decorate the top and they loved it.