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Chocolate Chunk Oatmeal Cookie Bars

These chocolate chunk oatmeal cookie bars are soft and chewy with deep brown sugar, decadent chopped chocolate, and old-fashioned oats.

Chocolate Chunk Oatmeal Cookie Bars stacked on top of each other.

Looking for an easy and delicious cookie to make for friends and family? 

These chocolate chunk oatmeal cookie bars are perfect for any time! Dinner party? Check. Birthday party? Check. Breakfast? Check!

They’re full of chewy, old-fashioned oats, delicious chopped chocolate, sweet brown sugar, and yummy butter. What’s not to love?

And they’re so easy to whip together with a spoon, there’s no need to drag out the stand mixer on this one.

This recipe is foolproof, so it’s also a great way to get the little ones to help, too!

Trust me, these cookie bars are going to be your new favorite chocolate treat!

Chocolate Chunk Oatmeal Cookie Bar ingredients on a table.
  • Butter – This is the fat of choice for our chocolate chunk oatmeal cookie bars, to add moisture and delicious buttery flavor.
  • Brown sugar – Brown sugar will add sweetness and a deep molasses flavor.
  • Eggs – Eggs will help emulsify the ingredients in our batter.
  • All-purpose flour – AP Flour is a common baking ingredient that will help hold the batter together.
  • Old-fashioned oats – This will help pull the cookie together and bring a delicious chewy texture to the cookie bars.
  • Baking soda – This will help our oatmeal bars stay fluffy and not become dense and hard.
  • Chopped chocolate – Arguably my favorite part of these, delicious chocolatey chunks that will add lots of yummy chocolate flavor!
  • Vanilla extract – Vanilla extract will add a subtle, sweet vanilla flavor.
Chocolate Chunk Oatmeal Cookie Bars uncooked in a quarter sheet pan.
Cooked Chocolate Chunk Oatmeal Cookie Bars in a quarter sheet pan.

What kind of oats should I use?

I’ve used old-fashioned oats here because they have a great chewy texture and cook fairly quickly. 

You could use quick-cooking oats, but you wouldn’t have the same delightful chewy texture in the end. 

I wouldn’t recommend steel-cut oats, because those are too dense and hard, and would not be pleasant to chew through in these cookie bars. 

Chocolate Chunk Oatmeal Cookie Bars sprinkled with sea salt.

Different types of chocolate

My favorite chocolate to use is semi-sweet because it contains no more than 50% sugar, so it’s the perfect balance of sweet and dark.

But if you prefer all dark, or all milk chocolate, absolutely go for it! 

Oatmeal Cookie Bars on parchment paper.

Other additions

You don’t have to stop at chopped chocolate, you can add any of these fantastic sweets to our oatmeal cookie bars:

  • Reese’s pieces
  • Raisins
  • Dried cranberries
  • Toffee bits
  • Butterscotch chips
  • Nuts (walnuts, pecans, peanuts)

Storage and leftovers

Any leftover chocolate chunk oatmeal cookie bars can be stored in an airtight container and left on the counter for up to 2 days.

Chocolate Chunk Oatmeal Cookie Bars sliced on a table.

More cookie recipes

Chocolate Chunk Oatmeal Cookie Bars

Author: Brandy O’Neill – Nutmeg Nanny
These chocolate chunk oatmeal cookie bars are soft and chewy with deep brown sugar, decadent chopped chocolate, and old-fashioned oats.
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Prep Time 10 minutes
Cook Time 30 minutes
Total Time 40 minutes
Servings 18 cookie bars


  • 12 tablespoons unsalted butter softened
  • 1-1/2 cups brown sugar packed
  • 2 large eggs
  • 2 teaspoons pure vanilla extract
  • 2 cups old fashioned oats
  • 1-1/2 cups all-purpose flour
  • 1-1/2 teaspoons baking soda
  • 2 cups chocolate chunks
  • Flakey sea salt optional


  • Preheat your oven to 350 degrees F and line a quarter sheet pan with parchment paper or spray it with nonstick baking spray.  This recipe can also be made in a 9×13 cake pan but a quarter sheet pan is just the right height! 
  • Add the softened butter and brown sugar to the bowl of a stand mixer fitted with the paddle attachment. Beat on medium speed until well combined, about 1 minute. 
  • Next, add the eggs and vanilla extract and mix to combine. Make sure to scrape down the sides of the bowl as needed.
  • Next, add the oats, flour, and baking soda. Mix on low speed, just until combined.
  • Finally, add the chocolate chunks and fold them into the dough.
  • Transfer the dough to the prepared pan and spread it into a smooth, even layer. 
  • Bake for 28-30 minutes, or until the bars are golden brown around the edges and fully set in the center. 
  • Allow the cookie bars to cool completely in the pan. Then, remove them to a cutting board and slice them into your desired size.  


Serving: 1g | Calories: 339kcal | Carbohydrates: 48g | Protein: 5g | Fat: 14g | Saturated Fat: 9g | Polyunsaturated Fat: 5g | Cholesterol: 45mg | Sodium: 202mg | Fiber: 2g | Sugar: 30g
Course Dessert
Cuisine American
Keyword chocolate chip oatmeal cookies, chocolate oatmeal cookie bars, cookie bars, oatmeal cookie bars, oatmeal cookies
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Chocolate Chunk Oatmeal Cookie Bars pin for Pinterest.

About Brandy!

I am a food lover and recipe developer bringing you delicious recipes that taste great and are easy to make! My food is inspired by travels around the world and my love of flavorful food. A list of things that make me happy: cats, Coke Zero, houseplants, and travel. Read more...

Recipe Rating

Karen Jones

Monday 23rd of January 2023

This looks yum 😋 have to try this and amend for my granddaughter who is gluten, egg and nut free


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