Easy and delicious Oatmeal Chocolate Chip Cookie Bars are thick, chewy, and highly addicting. Made with simple ingredients, this oatmeal bar recipe will become a family favorite!
If you aren’t baking your cookies into bars, you are in for a treat! I mean, is there anything better than a cookie recipe that requires very little effort and half the prep time? These Oatmeal Chocolate Chip Cookie Bars are chewy, delicious, and perfect for when you are in need for a quick and easy dessert. I love them as a sweet snack, or dessert. And, I wouldn’t be against topping a warm chocolate chip bar with a scoop of your favorite ice cream!
This is the best Oatmeal Chocolate Chip Cookie Bar Recipe EVER! They are thick, chewy, highly addictive, and easy to make with simple ingredients! Everyone needs a delicious bar recipe for days when you simply don’t have the time to make individual cookies. These Oatmeal Chocolate Chip Cookie Bars are such an easy dessert to whip up for last minute!
I’ve tested many cookie bar recipes, and this is by far one of my top favorites. The bars are soft, chewy and flavorful. They’re so easy to make with only simple ingredients you probably already have in your fridge and pantry!
BEST OATMEAL CHOCOLATE CHIP COOKIE BAR RECIPE: INGREDIENTS AND SUBSTITUTIONS
Without quality ingredients, even the best recipes will be unsuccessful. So, let’s talk a little about the ingredients in this oatmeal cookie bar recipe, as well as some substitutions!
- Flaxseed Meal. This is my secret ingredient for the perfect chewy oatmeal cookie bars. This recipe calls for a “flax egg” which is essentially flax meal mixed with water and left to sit until thickened. The flaxseed meal not only takes on the role of an extra egg in these bars, but it also helps increase the liquids, which are essential factors for chewiness. Ground chia seeds work the same way in this recipe!
- Butter. I always use salted butter because it does not contain any added flavorings. If you use unsalted butter, increase the salt by ½ tsp.
- Dark Brown Sugar. I recommend using dark brown sugar in this recipe. However, if you want a lighter tasting sugar, you can use light brown sugar instead.
- Oat Flour. If you don’t keep oat flour on hand, you can simply use ½ cup of old fashioned oats and grind them in a blender or food processor.
- Old Fashioned Oats. Quick-cooking oats can be used here, but the bars will not be as chewy.
- Whole Wheat Pastry Flour. I love the heartiness and nuttier flavor of whole wheat pastry flour compared to all purpose. If you don’t have whole wheat pastry flour, you can substitute for all purpose or 1:1 gluten free flour.
- Dark Chocolate. I always choose a high-quality chocolate for my baking! For this recipe, you can use chips or chopped chocolate from a bar. I typically use Ghirardelli 72% Dark Chocolate.
- Flaked Sea Salt. Flaked sea salt is a staple in my kitchen! This is completely optional, but I love a sweet/salty balance in my desserts.
HOW DO YOU MAKE OATMEAL CHOCOLATE CHIP COOKIE BARS?
Let’s get started by going through this cookie bar recipe step-by-step!
STEP 1: PREPARE INGREDIENTS & BAKING PAN
It’s important to have all the ingredients at room temperature before you get started. Ingredients that are at room temperature are mix better together and produce better results!
You will also need to prepare your baking pan by lining it with parchment paper so that you can easily lift the cookie bars out of the pan once they have finished baking.
STEP 2: MAKE FLAX EGG
“Flax eggs” need some time to set, so begin by combining water and flaxseed meal in a small bowl. Place the bowl in the refrigerator to thicken for about 10 minutes.
STEP 3: CREAM BUTTER WITH SUGARS
While the flaxseed meal is in the refrigerator, cream the butter with the sugars using paddle attachment in your stand mixer. You can also use a hand held mixer. This chewy chocolate chip cookie bar recipe is made using the creaming method – much like your typical cookie.
STEP 4: ADD FLAX MEAL, EGG, & VANILLA EXTRACT
Once the butter is creamed, add the thickened flaxseed meal, egg, and vanilla extract to the mixture and mix until evenly incorporated.
STEP 5: ADD DRY INGREDIENTS
In a separate bowl, whisk together the flour, oat flour, oats, baking powder, baking soda, and sea salt to combine. Add the dry ingredients to the wet ingredients and mix until there are no more dry spots.
STEP 6: STIR IN CHOCOLATE
Add the chocolate to the batter and mix to combine. I like to reserve a handful of chocolate to sprinkle on top of the bars before baking. If desired, this is a great place to add chopped nuts to the mix!
STEP 7: POUR INTO BAKING PAN
Once the chocolate is mixed into the batter, pour it into your parchment lined baking pan. Use a spatula to level the batter and sprinkle the reserved chocolate on top.
STEP 8: BAKE OATMEAL CHOCOLATE CHIP COOKIE BARS
Bake the cookies bars for 20-25 minutes. The cookie bars will be soft, but will firm up once cooled. Once baked, remove the pan from the oven and place on a cooling rack to cool for 10 minutes. Then, use the parchment paper to lift the bars out of the pan and place on a wire rack to cool completely.
STEP 9: CUT OATMEAL CHOCOLATE CHIP COOKIE BARS AND ENJOY!
Once the bars have cooled down, sprinkle with flaked sea salt and cut into bars. Then, grab a glass of milk and enjoy!
HOW DO I STORE OATMEAL CHOCOLATE CHIP COOKIE BARS?
If you have any leftovers, you can store these Oatmeal Chocolate Chip Cookie Bars in an airtight container. They will last at room temperature for 3 days, or in the refrigerator for up to a week.
CAN YOU FREEZE COOKIE BARS?
Yes! To freeze these cookie bars, wrap each bar individually in plastic wrap wrapping them tightly in plastic wrap. Storing the wrapped cookie bars in an airtight container or ziplock bag in the freezer for up to 1 month.
WHY ARE MY OATMEAL COOKIE BARS DRY AND HARD?
Cookie bars dry out if they have been overbaked or exposed to air.
For chewy Oatmeal Cookie Bars:
- Make sure you bake do not overbake them. They will look slightly underbaked as soon as you pull them out of the oven.
- Store them properly - keep the bars stored in an airtight container.
More Bar Recipes You'll Love!
White Chocolate Blondies with Raspberry Frosting - chewy, sweet, and delicious.
No-Bake Dark Chocolate Nut Bars - vegan, gluten free, & Paleo.
Matcha White Chocolate Lamingtons - a perfect afternoon treat!
Strawberry Swirl Fudge Brownies - decadent, rich, and chocolatey.
If you make this recipe, take a photo and tag #bakedambrosia on Instagram and Facebook so that I can see your creations and feature them on Instagram! To stay up to date with the latest recipes, follow Baked Ambrosia on Pinterest, Facebook, Instagram, and Youtube. ♡
Oatmeal Chocolate Chip Cookie Bars
- 1/ 4 cup 60 ml water
- 1 tbsp 6 g flaxseed meal
- ¼ cup 56 g salted butter, room temperature
- ¾ cup 175 g dark brown sugar
- ⅓ cup 75 g sugar
- 1 egg
- 1 tsp vanilla extract
- 1 cup 140 g whole wheat pastry flour
- ½ cup 55 g oat flour
- ½ cup 55 g old fashioned oats
- ½ tsp baking powder
- ½ tsp baking soda
- ¼ tsp salt
- ¼ tsp cinnamon
- 5 oz 150 g dark chocolate, chopped or chocolate chips
- flaked sea salt for topping (optional)
- Preheat oven to 350 degrees F. Line an 8 x 8 - inch pan with aluminum foil.
- In a small bowl, combine water and flaxseed meal. Place in refrigerator to thicken, about 10 minutes.
- While flaxseed meal is in the refrigerator, prepare the rest of the batter. In the bowl of electric fitted with the paddle attachment, or with a hand mixer, beat butter with sugars on medium-low speed until pale and creamy, about 3-5 minutes. Add egg, vanilla extract, and thickened flaxseed meal. Beat until combined.
- In a separate bowl, whisk together flour, oat flour, oats, baking powder, baking soda, salt, and cinnamon. Add to butter/sugar mixture and mix until well combined. Fold in chocolate, reserving a few pieces to sprinkle over the top.
- Pour batter into prepared pan and bake for 18-20 minutes. Remove from oven and let cool in pan for 10 minutes, before using aluminum foil to pull the bars out of the pan. Place on wire rack to cool completely.
- Once bars are completely cool, sprinkle with flaked sea salt and cut into squares.