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Oatmeal Chocolate Chunk Cookie Brownies

Half oatmeal cookie and half decadent peanut butter fudge brownie.  These Oatmeal Chocolate Chunk Cookie Brownies are loaded with delicious flavor. They are so sinfully rich and tasty that they remain my favorite cookie brownie of all time.

Oatmeal Chocolate Chunk Cookie Brownies - A close up of layered peanut butter swirl brownies topped with oatmeal cookie dough and chocolate chunks.

A chocolate chunk brownie layered with a classic oatmeal cookie and layered with more brownie and peanut butter swirls with chocolate chunks.  In case you didn’t know, this is a brookie.  

A cookie + brownie = brookie.  Yes, it’s a real thing and it’s delicious.  I couldn’t decide what I wanted more, a cookie or brownie, so this happened.  It’s one of those gourmet recipes that will cure any craving you’re having.  These Oatmeal Chocolate Chunk Cookie Brownies are that good!

Ghirardelli Chocolate - A bar of Ghiradelli chocolate chopped on a slate board.
Ghirardelli Chocolate

Simple and perfectly chewy, ooey-gooey bars. This recipe is stuffed with chocolate, peanut butter, and warm oatmeal flavors. Just when you get a hint of oatmeal cookie, you bite into peanut butter. Ummm Yum. this makes me hungry just talking about it!  Just in time for the weekend because I think I need to make some more and pack them on my road trip back to Wisconsin.

Oatmeal Chocolate Chunk Brownie Cookie Ingredients

  • CHOCOLATE: A combination of baking chocolate, cocoa powder, and chocolate chips/chunks is used in this recipe.
  • OATMEAL: Old-fashioned oatmeal.
  • PEANUT BUTTER: Creamy, smooth peanut butter gets swirled into the brownie batter.
  • FLOUR: all-purpose flour works perfectly.
  • OIL: Yields a moist oatmeal cookie base.
Oatmeal Chocolate Brookies - An overhead view of the oatmeal cookie chocolate chunk brownie with melted peanut butter, oatmeal chunks, and melted chocolate on top.

How to Make Brookies

  1. Whisk melted chocolate and sugar.
  2. Whisk in eggs and vanilla extract.
  3. Stir in cocoa powder, salt, flour, and chocolate chunks.
  4. Stir in melted peanut butter.
  5. Mix together oatmeal, flour, brown sugar, baking soda, salt, oil, egg, and vanilla.
  6. Fold in chocolate.
  7. Drop dollops of brownie batter in pan.
  8. Sprinkle with oatmeal cookie dough.
  9. Top with remaining brownie batter and cookie dough.
  10. Swirl in melted peanut butter.
  11. Bake in 350°F oven for 25-35 minutes.
  12. Cool 1 hour. Cut and serve.

Honestly, this is the best combination of a cookie and a brownie. They’re pretty amazing, delicious, and are seriously one of my favorite treats.

Oatmeal Chocolate Chip Cookie Brownies - brookie bars stacked on wood. Text in center reads oatmeal cookie chocolate chunk brownies.
A collage of images featuring the steps to make the brookies.
Oatmeal Chocolate Chip Cookie Brownies
Oatmeal Cookie Brownies

Oatmeal Chocolate Chunk Cookie Brownies

Soft and chewy oatmeal cookie and chocolate chunk brownies combined into a decadent brookie.
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Prep Time 20 minutes
Cook Time 25 minutes
Total Time 45 minutes
Course Dessert
Cuisine American
Servings 18
Calories 374 kcal


  • Brownie
  • 10 tablespoons unsalted butter
  • 2 ounces milk or semi sweet chocolate , chopped
  • 1 cup granulated sugar
  • 1 1/2 teaspoons vanilla extract
  • 2 large eggs
  • 1/2 cup cocoa powder
  • 1/2 cup all-purpose flour
  • 1/4 teaspoon kosher salt
  • 1/3 cup semi sweet chocolate chips or chocolate chunks
  • 1/2 cup creamy peanut butter , melted
  • Oatmeal Cookie
  • 1 1/3 cup old fashioned oats
  • 1 cup all-purpose flour
  • 1/2 cup brown sugar
  • 1/2 teaspoon baking soda
  • 1/4 teaspoon salt
  • 1/2 cup oil
  • 1 egg
  • 2 teaspoons vanilla extract
  • 4 ounces dark chocolate , chopped into chunks
  • Handful of chocolate chunks


  • Preheat the oven to 350 degrees. Line a 9×13 inch baking dish with foil or parchment paper and grease.
  • Brownie Batter – Combine butter and 2 ounces chocolate to a microwave safe bowl. Microwave on 30 second intervals, stirring after each interval until melted and smooth. This takes me about 1 minute and 30 seconds.
  • In a medium bowl, combine melted chocolate mixture and sugar, whisking until completely combined. Add vanilla extract and eggs then whisk until smooth. Stir in the cocoa powder, flour and salt until smooth and just combined, try not to over mix the batter. It will be thick. Stir in remaining chocolate chips/chunks. Melt peanut butter in microwave safe bowl and add 1/4 cup of the melted peanut butter (you will use the remaining 1/4 cup later) and gently stir, leaving a few streaks of peanut butter; set aside.
  • Oatmeal Cookie – In a large mixing bowl or bowl of a stand mixer, add the oatmeal, flour, brown sugar, baking soda, salt, oil, egg and vanilla and beat until combined and the dough holds together (the dough will seem oily, this is good, if not add a tablespoon more of oil). Fold in about 1/2 cup of the chocolate chunks.
  • Assemble – Drop dollops of about half the brownie batter into the prepared pan (see images below). Sprinkle 3/4 of the oatmeal cookie dough around and over the brownie batter and in the corners. Dollop the remaining brownie batter over top the oatmeal cookie dough. Remelt peanut butter in microwave and swirl into brownie batter dollops, using a knife to swirl it. Drizzle any remaining over entire pan. Slightly press a handful of chocolate chunks into the top of batter.
  • Bake for about 25-35 minutes, just do not over bake. Cover with foil the last 10 minutes to ensure the top does not get crispy. Allow bars to cool in pan for at least 1 hour before slicing and serving.


Calories: 374kcalCarbohydrates: 38gProtein: 6gFat: 23gSaturated Fat: 9gTrans Fat: 1gCholesterol: 45mgSodium: 149mgPotassium: 219mgFiber: 3gSugar: 22gVitamin A: 242IUCalcium: 31mgIron: 3mg

Nutritional information is only an estimate and it’s accuracy is not guaranteed to be exact.

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updated 6/2021

15 Responses

  1. HOLY YUM! Wow, these look good enough to eat …. or lick the computer screen. Thanks for sharing this recipe, I’m definitely going to try these cookies/brownies/bars as soon as possible. As a lactating momma, I’ll add a handful of flax seed as well. With the exception of the “brownie” part, my favorite “milk maker” cookies combine chocolate chip cookies with milk-producing ingredients: whole oats and flax seed. The peanut butter in these bars takes them to a whole ‘nother level of yumminess. THANKS AGAIN FOR SHARING. 🙂

    p.s. I’m sorry someone didn’t properly warn you about the heat and humidity in The South. If you were my neighbor, I’d offer you a glass of sweet tea while we sit a spell and (impatiently) wait for these brookies to bake. HA!

    1. I’d love to have you as my neighbor, it sounds like a lot of fun! And the flax seeds, I love the idea and will have to try it next. Thank you for your kind words!

  2. Wow, could these look any more delicious? I gained 10 pounds just looking at them. I’m definitely going to make these–maybe today!

  3. Your photos make me want to leap right in and take a bite! The combination of oatmeal cookie and brownie looks and sounds delicious! Pinning to make asap!

  4. Visiting from the Show-Licious Link Party. These looks amazing, I love anything with oats and chocolate in, delicious! I co-host Sweet and Savoury Sunday and would love for you to stop by and share this and other recipes with us. Have a great day!

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