Chunky Monkey Oatmeal Cookie (Printable Version)

Golden baked oats with banana, chocolate chips, and walnuts in a cast-iron skillet.

# What You'll Need:

→ 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

# Directions:

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 the wet mixture and whisk well. Stir in mashed bananas until fully combined.
05 - Pour wet mixture into dry ingredients. 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, or until the top is golden and the edges are set but the center remains slightly soft.
09 - Let cool for 10 minutes before serving warm. Serve slices directly from the skillet, optionally topped with ice cream.

# Additional Tips::

01 -
  • It bakes in under 25 minutes, so you can satisfy a sudden sweet craving without the wait.
  • The entire skillet becomes a shared dessert, which somehow makes it taste even better when you're eating straight from the pan.
  • Soft center, crispy edges, and that banana-chocolate combination that tastes like it came from a premium smoothie bar.
02 -
  • Overbaking by even two minutes can dry out the center; set a timer and check at 20 minutes first because oven temperatures vary wildly.
  • The bananas must be truly ripe with brown spots—green bananas won't provide enough flavor or sweetness, and the cookie will taste flat.
03 -
  • Toast your walnuts in a dry skillet for two minutes before folding them in—it deepens their flavor and makes them taste toasted even though they're raw when baked.
  • Mash your bananas by hand with a fork instead of using a blender or food processor, which can make them watery and throw off your liquid balance.
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