Chunky Monkey Oatmeal Skillet Cookie

Featured in: Sweet Harmony

This indulgent skillet dessert combines mashed ripe bananas with old-fashioned oats, creating a chewy, satisfying texture. The semisweet chocolate chips melt throughout while toasted walnuts add crunchy contrast. Baked in a cast-iron pan, the edges turn perfectly golden with a soft, gooey center. Ready in under 40 minutes, this shareable treat serves eight people beautifully when warm. Optional coconut flakes bring tropical sweetness that complements the classic banana-chocolate combination inspired by everyone's favorite smoothie flavors.

Updated on Mon, 09 Feb 2026 07:13:46 GMT
Golden-brown Chunky Monkey Oatmeal Cookie Skillet served warm from the oven with melting chocolate chips. Save
Golden-brown Chunky Monkey Oatmeal Cookie Skillet served warm from the oven with melting chocolate chips. | sugarprairie.com

This Chunky Monkey Oatmeal Cookie Skillet is a warm, shareable dessert inspired by the classic smoothie flavors of banana, chocolate, and nutty goodness. Baked to golden perfection in a cast-iron pan, it is the ultimate comfort treat for any occasion.

Golden-brown Chunky Monkey Oatmeal Cookie Skillet served warm from the oven with melting chocolate chips. Save
Golden-brown Chunky Monkey Oatmeal Cookie Skillet served warm from the oven with melting chocolate chips. | sugarprairie.com

Bringing together the wholesome texture of rolled oats with the sweetness of mashed bananas, this skillet cookie offers a delightful twist on a classic oatmeal cookie. The addition of walnuts and shredded coconut provides a satisfying crunch that complements the gooey melted chocolate chips.

Ingredients

  • 1 1/2 cups (165 g) old-fashioned rolled oats
  • 1 cup (125 g) all-purpose flour
  • 1/2 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1/2 teaspoon ground cinnamon
  • 1/2 cup (115 g) unsalted butter, melted and slightly cooled
  • 1/2 cup (100 g) light brown sugar, packed
  • 1/4 cup (50 g) granulated sugar
  • 1 large egg
  • 2 teaspoons vanilla extract
  • 2 medium ripe bananas, mashed (about 1 cup / 225 g)
  • 1/2 cup (90 g) semisweet chocolate chips
  • 1/2 cup (55 g) chopped walnuts
  • 1/4 cup (25 g) unsweetened shredded coconut (optional)
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Instructions

Step 1
Preheat your oven to 350°F (175°C). Lightly grease a 10-inch cast-iron skillet with butter or nonstick spray.
Step 2
In a large bowl, whisk together the oats, flour, baking soda, salt, and cinnamon.
Step 3
In a separate bowl, combine the melted butter, brown sugar, and granulated sugar. Whisk until smooth.
Step 4
Add the egg and vanilla extract to the wet mixture; whisk well. Stir in the mashed bananas until fully combined.
Step 5
Pour the wet mixture into the dry ingredients. Mix until just incorporated.
Step 6
Gently fold in the chocolate chips, walnuts, and coconut (if using).
Step 7
Spread the dough evenly into the prepared skillet.
Step 8
Bake for 20–24 minutes, or until the top is golden and the edges are set but the center is still a bit soft.
Step 9
Let cool for 10 minutes before serving warm. Serve slices directly from the skillet, optionally topped with ice cream.

Zusatztipps für die Zubereitung

This skillet cookie is best enjoyed warm. If you have leftovers, they can be gently reheated in the skillet or a microwave to restore the gooey texture of the chocolate.

Varianten und Anpassungen

For a nut-free version, omit the walnuts or substitute them with sunflower seeds. You can also substitute peanut butter chips for chocolate chips for an extra layer of flavor.

Serviervorschläge

Serve slices directly from the skillet for a rustic feel. It is especially delicious when topped with a scoop of vanilla ice cream that melts into the warm cookie.

Chunky Monkey Oatmeal Cookie Skillet topped with vanilla ice cream melting into gooey chocolate. Save
Chunky Monkey Oatmeal Cookie Skillet topped with vanilla ice cream melting into gooey chocolate. | sugarprairie.com

Whether shared with friends or enjoyed as a family treat, this Chunky Monkey Oatmeal Cookie Skillet is a guaranteed crowd-pleaser. Enjoy the perfect balance of wholesome oats and indulgent mix-ins in every bite.

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Kitchen Help

Can I make this skillet cookie ahead of time?

Yes, you can prepare the dough up to 24 hours in advance and store it refrigerated. Let it come to room temperature for 15 minutes before baking. The baked skillet also reheats beautifully in a 300°F oven for 10 minutes or over low heat on the stovetop.

What makes this different from regular oatmeal cookies?

The mashed bananas create extra moisture and natural sweetness while keeping the texture softer than traditional oatmeal cookies. Baking in a cast-iron skillet produces crispy edges with a warm, pudding-like center that's perfect for scooping.

Can I use quick oats instead of old-fashioned rolled oats?

Old-fashioned oats provide better texture and structure. Quick oats will make the final result softer and less chewy. If you only have quick oats, reduce the amount to 1 cup to prevent the batter from becoming too loose.

How do I know when it's done baking?

The edges should be golden brown and set, while the center will still have a slight jiggle when gently shaken. A toothpick inserted near the edges should come out mostly clean, but the center may still have melted chocolate on it.

What can I serve with this skillet dessert?

Warm servings pair perfectly with vanilla ice cream, whipped cream, or a drizzle of caramel sauce. For extra indulgence, top with chocolate sauce or a sprinkle of sea salt while still warm to enhance the banana and chocolate flavors.

Can I freeze the unbaked dough?

Freeze the dough directly in the skillet wrapped tightly with plastic wrap and foil for up to 3 months. Thaw overnight in the refrigerator before baking as directed. Alternatively, freeze individual portions and bake in ramekins for single servings.

Chunky Monkey Oatmeal Skillet Cookie

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

Setup duration
15 min
Heat duration
22 min
Complete duration
37 min
Created by Molly Evans

Classification Sweet Harmony

Complexity Easy

Heritage American

Output 8 Portions

Nutrition guidelines Meat-free

Components

Dry Ingredients

01 1.5 cups old-fashioned rolled oats
02 1 cup all-purpose flour
03 0.5 teaspoon baking soda
04 0.5 teaspoon salt
05 0.5 teaspoon ground cinnamon

Wet Ingredients

01 0.5 cup unsalted butter, melted and slightly cooled
02 0.5 cup packed light brown sugar
03 0.25 cup granulated sugar
04 1 large egg
05 2 teaspoons vanilla extract
06 2 medium ripe bananas, mashed

Mix-ins

01 0.5 cup semisweet chocolate chips
02 0.5 cup chopped walnuts
03 0.25 cup unsweetened shredded coconut, optional

Method steps

Phase 01

Prepare the skillet: Preheat oven to 350°F. Lightly grease a 10-inch cast-iron skillet with butter or nonstick spray.

Phase 02

Combine dry ingredients: In a large mixing bowl, whisk together oats, flour, baking soda, salt, and cinnamon.

Phase 03

Mix wet base: In a separate bowl, combine melted butter, brown sugar, and granulated sugar. Whisk until smooth.

Phase 04

Incorporate wet ingredients: Add egg and vanilla extract to the wet mixture and whisk well. Stir in mashed bananas until fully combined.

Phase 05

Combine mixtures: Pour wet mixture into dry ingredients and mix until just incorporated.

Phase 06

Add mix-ins: Gently fold in chocolate chips, walnuts, and coconut if using.

Phase 07

Transfer to skillet: Spread dough evenly into the prepared cast-iron skillet.

Phase 08

Bake: Bake for 20 to 24 minutes, until the top is golden and edges are set but center remains slightly soft.

Phase 09

Cool and serve: Let cool for 10 minutes before serving warm. Serve slices directly from the skillet, optionally topped with ice cream.

Kitchen tools needed

  • 10-inch cast-iron skillet
  • Mixing bowls
  • Whisk
  • Spatula
  • Measuring cups and spoons

Dietary concerns

Review ingredients carefully for potential allergens and seek professional medical guidance if uncertain.
  • Contains wheat and gluten
  • Contains eggs
  • Contains milk from butter and chocolate chips
  • Contains tree nuts including walnuts and possibly coconut

Dietary breakdown (per portion)

Values shown are estimates only - consult healthcare providers for specific advice.
  • Energy: 320
  • Fats: 16 g
  • Carbohydrates: 41 g
  • Proteins: 5 g