Oatmeal Cookie Bars

These oatmeal cookie bars are a heartier, chewier version of my chocolate chip cookie bars! Buttery, thick, chewy, and chock full of oats and (optional) chocolate pieces, these are easy to make with no mixer required! 

Be sure to check out my step-by-step video just below the recipe!

Cookie bars are the ultimate sweet treat for when you really want cookies but are just too lazy to spend an hour scooping cookie dough.

Alright, so they’re really good anytime, but I’ve been there before too many times to count. Some of my favorite recipes were born of sheer laziness and cookie dough scooping fatigue (I’m looking at you, sugar cookie bars).

And while the lazy factor is a big plus for me, the best part is that we sacrifice nothing in terms of taste. These oatmeal cookie bars are like one of my big soft oatmeal cookies, only even thicker and chewier and loaded with a variety of (optional) chocolate chips. Oh and let’s not forget the best part: no chilling and no scooping required!

While you can make these cookie bars “plain” with no add-ins, I love adding chocolate chips or even chopped nuts to mine. For today’s oatmeal cookie bars I used a blend of milk and semisweet chocolate and butterscotch chips.

Occasionally I’ll toss in chopped walnuts as well. My last batch was a mix of walnuts, dark chocolate and caramel chips (here’s where I’d insert the drooling emoji if I could find it on my keyboard).

You can add your favorite add-ins, but I recommend only using about a cup and a half.

If you’re feeling a little lazy yourself this morning (or evening, or whenever you’re reading this) but also hear your sweet tooth calling, this is the dessert for you.

Let me know what you think of it! My sister-in-law loved these and if you like them half as much as she did they’ll be well worth your time.


Looking for more lazy-day bar cookie recipes?

  • Rice Krispie Treats
  • Peanut Butter Bars
  • Homemade Brownies

Oatmeal Cookie Bars

How to make hearty Oatmeal Cookie Bars!
Recipe includes video at the bottom of the post!
4.7 from 10 votes
Print Pin Rate
Course: Dessert
Cuisine: American
Keyword: bar cookies, cookie bars, easy dessert, oatmeal cookies, oatmeal desserts
Prep Time: 15 minutes
Cook Time: 40 minutes
Total Time: 55 minutes
Servings: 16 bars
Calories: 375kcal
Author: Samantha Merritt


  • 1 cup butter melted (226g)
  • 1 cup light brown sugar tightly packed (200g)
  • 1/2 cup sugar 100g
  • 2 large eggs + 1 large egg yolk
  • 1 1/2 teaspoons vanilla extract
  • 1 1/4 cup all-purpose flour 157g
  • 2 teaspoons cornstarch cornflour in UK
  • ½ teaspoon baking powder
  • 3/4 teaspoon salt
  • 1/4-1/2 teaspoon ground cinnamon optional
  • 3 cups old fashioned rolled oats 285g
  • 1 1/2 cups chocolate chips optional, I did a mix of semisweet chocolate chips, milk chocolate chips, and butterscotch chips (255g)


  • Preheat oven to 350F (175C) and line a 9x9 metal baking pan with parchment paper or grease and flour the sides and bottom of the pan.*
  • Combine butter and sugars in a large bowl and stir until well-combined.
  • Add eggs and vanilla extract and stir well.
  • In a separate bowl, whisk together flour, cornstarch, baking powder, salt, and cinnamon (if using).
  • Gradually add dry ingredients to wet until completely combined.
  • Add oats and chocolate chips and stir until well combined.
  • Spread cookie dough evenly into prepared baking pan and bake on 350F (175C) for 35-40 minutes or until a toothpick inserted in the center comes out clean or with a few moist crumbs.



*A glass baking pan will work for this recipe instead but it will likely take longer to bake.


Serving: 1bar | Calories: 375kcal

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