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Making Friday even sweeter with these Healthier Dark Chocolate Chunk Oatmeal Cookie Bars. These one-bowl homemade oatmeal cookie bars with dark chocolate chunks and a sprinkle of flaky sea salt are the perfect way to end the week. They’re super easy and made a touch healthier with a mix of whole grain oats, whole wheat flour, coconut or olive oil, and a reduced amount of sugar. But most importantly, everyone LOVES these oatmeal bars! Plus, they’re pretty difficult to mess up…they always turn out GREAT.

Going back to my childhood roots with these oatmeal cookie bars. For any of you that know anything about my mom, you know that when my brothers and I were growing up, she’d have dessert on the table before dinner was even a thought. Her staples were chocolate chip cookies, special K-bars, chocolate cake, and her famous oatmeal chocolate chip cookies that she’s been making ever since her friend Lora gave her the recipe (before I was even born).
Oh her cookies. My memories of them are so fond and perfect. We’d always eat them a little warm and gooey right after baking and always with a cold glass of milk. Very classic, right? To this day, these are some of my favorite memories. Baking in the kitchen with mom and zero brothers around.
Fun fact? My purpose in life as a kid was to figure out a way to get mom all to myself without any of my five brothers. It was tricky, but when I made it happen I loved every minute of our one-on-one time.

Anyway, when my mom wasn’t feeling like baking her round chocolate cookies, she’d make oatmeal cookie bars. Her recipe is EASY and it’s the BEST. You simply cannot beat a one large bowl, ten-minute prep, and pantry staple cookie bar.
Mom would make her oatmeal cookie bars once a week. And there were definitely many weeks she’d make them twice. When a recipe is as easy and as delicious as her bars, it becomes a staple in the kitchen. But here’s the truth. Over the years I’ve adapted her recipe, making small tweaks here and there to adjust them to be a little bit healthier and taste maybe even better?
Maybe…
It’s hard to beat an oatmeal cookie bar baked by my mom, but these healthier dark chocolate chunk oatmeal cookie bars come very, very close.

This recipe requires just one bowl and a spoon…no mixer. It’s completely no-fuss, and takes ten minutes to toss together. You can’t mess these bars up. They are practically foolproof.
In your mixing bowl combine all of the dry ingredients. Now, add all of the wet ingredients. Mix away until you have a crumbly dough. Stir in plenty fo dark chocolate chunks, then press the dough into a baking dish. Bake twenty minutes and sprinkle with flaky sea salt once you remove them from the oven.
Smell the wonderfulness? Do you see the melty chocolate?
I don’t love the word perfect, but these oatmeal cookies are pretty close to it.

Normally I’m all for butter, but with this cookie recipe there is no sub…oil is what works best, and is a bit healthier too. Over the years I’ve discovered that you can use melted coconut (which I prefer) or extra virgin olive oil (which is also delicious but adds a little flavor to the cookie).
To make these a heartier cookie, I replaced half of the white flour with whole wheat flour and reduced the sugar by half. And of course, was sure to stir in plenty of antioxidant-rich dark chocolate.
Oh, and you can’t forget a nice dusting of flaky sea salt. You don’t have to, but it sure is good…
One thing I do want to note is that these cookie bars are crumbly. It’s just the way they are, and it’s apart of what makes them delicious. So embrace the crumbly cookie bar. Promise you, it’s so good.

What I love about these cookies is that they’re so easy to make. They require no chilling and truly take just thirty minutes from start to finish. I almost always have these ingredients on hand. So when it’s Friday night and the urge for a delicious yet slightly healthier chocolatey cookie comes on? These cookies are always what I bake. Always.
They’re just perfectly crisp on the edges but soft and gooey in the middle. The best kind of cookie.
Bake these tonight, or sometime this weekend. Then make them again whenever you’re craving something sweet. Perfect for any time of the year bar, and such a great staple recipe. Hope you ENJOY!

Looking for other healthier desserts for the weekend? Some favorites…
Healthy…ish Homemade Samoas Cookies
Fudgy Avocado Brownies with Chocolate Fudge Frosting
Lastly, if you make these healthier dark chocolate chunk oatmeal cookie bars, be sure to leave a comment and/or give this recipe a rating! Above all, I love to hear from you guys and always do my best to respond to each and every comment. And of course, if you do make this recipe, don’t forget to tag me on Instagram! Looking through the photos of recipes you all have made is my favorite!
Nutritional information is only an estimate. The accuracy of the nutritional information for any recipe on this site is not guaranteed.

Just made these today!! Amazing. Love everything I’ve made from your cookbook. Thanks so much for sharing!
Thank you for trying these! I am so glad you loved them! Also, I hope you continue to love the recipes in my book!! xTieghan
If I baked these in a square dish, instead of 9×13, they’d be thicker. Do you know if that would require a change to the baking time? Thanks!
Hi Heather,
I would just add 5 minutes, just keep an eye on them. I hope you love the recipe, please let me know if you have any other questions. xTieghan
Can you use whole-wheat AP flour if you don’t have pastry flour?
Hi Anne,
Yes that would work! I hope you love the recipe, please let me know if you have any other questions. xTieghan
Do you need to use a whole wheat flour for the recipe? Is there a substitute if ever it’s not available?
Hi Cris,
You can use all AP flour. I hope you love the recipe, please let me know if you have any other questions. xTieghan
Would I be able to use regular whole wheat flour rather than whole wheat pastry flour? These look so good… Obsessed with everything you make!
Hi Katie,
Yes that will be okay. I hope you love the recipe, please let me know if you have any other questions. xTieghan
Kind of a silly question but…Can you substitute regular chocolate chips for the dark chocolate chunks?
Yes of course! I hope you love this one! xTieghan
Can I make this without the whole wheat flour?
Hi,
You can use all AP flour. I hope you love the recipe, please let me know if you have any other questions! xTieghan
I am such a fan of dark chocolate and do not like my desserts too sweet and so I knew this was going to be a winner. I did the lesser amounts of sugar and it was perfect!
Thank you so much Myla! xTieghan
I’ve been trying to find “healthy” dessert options to bake during quarantine, and loved these! I ended up using only 1/2 cup of oil and cut down the sugar a bit and they still turned out great. I also added a splash of milk to help bring the dough together since I cut down some of the wet ingredients.
Thank you so much Kayla! xTieghan
These taste so good!
I love the very light coconut taste and the dark chocolate.
mine are crumbly though (after cooling) anyone else??
Thank you for trying these Alyssa!! I am really glad they turned out well for you! xTieghan
Just made these, they look amazing, waiting for them to cool before cutting and most importantly eating one or three. Love that’s it’s all in the one bowl and so easy to make. My house smells delicious.
Thank you so much Stephanie! I am really happy to hear that! xTieghan
When measuring the coconut oil, is it 1 cup melted or measure one cup then melt it? What’s the best way to melt it as well? I’m excited to try this but have never baked with coconut oil before! Thanks!
Hi Maria,
It is one cup after it is melted. I hope you love the recipe, please let me know if you have any other questions! xTieghan
sorry! I should have read the most recent comments first, I will cut this in half and give it a try!
Hi Amy! I am glad you found it! I hope you love these bars! xTieghan
Can this be cut in half successfully for an 8×8 or 9×9 pan?
I used yogurt instead of oil and changed a few of the quantites of the recipe but this came out like a fluffy pancake cloud and was delicious!
Love that! Thank you so much Elena! xTieghan