Chunky Monkey Oatmeal Cookie Skillet (Printable View)

Warm banana chocolate walnut oatmeal skillet baked to golden perfection

# What You’ll Need:

→ Dry Ingredients

01 - 1½ cups old-fashioned rolled oats
02 - 1 cup all-purpose flour
03 - ½ teaspoon baking soda
04 - ½ teaspoon baking powder
05 - ¼ teaspoon salt

→ Wet Ingredients

06 - ½ cup unsalted butter, melted
07 - ⅓ cup packed light brown sugar
08 - ⅓ cup granulated sugar
09 - 1 large egg
10 - 1 teaspoon pure vanilla extract

→ Chunky Monkey Mix-ins

11 - 2 ripe bananas, mashed (approximately 1 cup)
12 - ½ cup semisweet chocolate chips
13 - ½ cup chopped walnuts
14 - ½ cup chopped dark chocolate (optional)

# How To Make It:

01 - Preheat oven to 350°F. Grease a 10-inch cast-iron skillet with butter or nonstick cooking spray.
02 - In a medium mixing bowl, whisk together oats, flour, baking soda, baking powder, and salt. Set aside.
03 - In a large mixing bowl, combine melted butter, brown sugar, and granulated sugar. Mix until smooth and creamy.
04 - Beat egg and vanilla extract into the butter mixture, then fold in mashed bananas until fully incorporated.
05 - Gradually fold dry ingredients into wet mixture until just combined. Do not overmix.
06 - Gently fold in chocolate chips, walnuts, and chopped dark chocolate if using.
07 - Spread batter evenly into prepared cast-iron skillet.
08 - Bake for 22 to 25 minutes until edges are golden brown and a toothpick inserted in center comes out mostly clean with few moist crumbs.
09 - Cool for 10 minutes. Serve warm directly from skillet, optionally topped with vanilla ice cream.

# Best Practices:

01 -
  • It feeds a crowd but feels personal, like you've handed someone warm comfort in a single pan.
  • Those chocolate-walnut pockets stay hidden until you bite through the chewy oat base, which is the kitchen equivalent of a small surprise.
  • The prep is genuinely quick, leaving you more time to actually sit down and enjoy it.
02 -
  • Bananas vary wildly in moisture content, so if your batter looks unusually wet, add an extra tablespoon of flour to prevent a gummy center.
  • The toothpick test is a suggestion, not law—pull the skillet when the edges look set and the center jiggles just barely, because carryover heat finishes the baking as it cools.
03 -
  • Measure your flour by spooning it into the cup and leveling it off rather than scooping directly from the bag—a scoop adds about 2 tablespoons extra flour than intended, which dries out the cookie noticeably.
  • Keep your bananas on the counter until they're almost too soft to hold, when they're at their sweetest and most pliable for mashing.
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