Chunky Monkey Oatmeal Cookie Skillet (Printable version)

Warm skillet cookie with mashed bananas, chocolate chips, and walnuts baked in a cast-iron pan.

# Ingredient list:

→ Dry Ingredients

01 - 1 1/2 cups old-fashioned rolled oats
02 - 1 cup all-purpose flour
03 - 1/2 teaspoon baking soda
04 - 1/2 teaspoon salt
05 - 1/2 teaspoon ground cinnamon

→ Wet Ingredients

06 - 1/2 cup unsalted butter, melted and slightly cooled
07 - 1/2 cup light brown sugar, packed
08 - 1/4 cup granulated sugar
09 - 1 large egg
10 - 2 teaspoons vanilla extract
11 - 2 medium ripe bananas, mashed

→ Mix-ins

12 - 1/2 cup semisweet chocolate chips
13 - 1/2 cup chopped walnuts
14 - 1/4 cup unsweetened shredded coconut, optional

# Step-by-step guide:

01 - Preheat oven to 350°F. Lightly grease a 10-inch cast-iron skillet with butter or nonstick spray.
02 - In a large bowl, whisk together oats, flour, baking soda, salt, and cinnamon.
03 - In a separate bowl, combine melted butter, brown sugar, and granulated sugar. Whisk until smooth.
04 - Add egg and vanilla extract to wet mixture and whisk well. Stir in mashed bananas until fully combined.
05 - Pour wet mixture into dry ingredients and mix until just incorporated.
06 - Gently fold in chocolate chips, walnuts, and coconut if using.
07 - Spread dough evenly into the prepared skillet.
08 - Bake for 20 to 24 minutes until top is golden and edges are set but center remains slightly soft.
09 - Let cool for 10 minutes before serving warm. Serve slices directly from skillet, optionally topped with ice cream.

# Expert tips:

01 -
  • Texture Heaven: A perfect balance of chewy oats, gooey chocolate, and crunchy walnuts.
  • One-Pan Simplicity: Easy to prepare and serve directly from a single cast-iron skillet.
  • Natural Sweetness: Uses ripe mashed bananas for moisture and a deep, fruity flavor.
02 -
  • Don't Overbake: The center should still be slightly soft when you remove it from the oven as it will continue to set while cooling.
  • Storage: Leftovers can be stored and gently reheated in the skillet to regain that fresh-baked texture.
  • Customization: If you love coconut, don't skip the optional shredded coconut for added tropical flair.
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