Chewy Oatmeal Cookie Bars are my go-to when I want the comfort of an oatmeal cookie in an easy, sliceable bar. They’re soft and chewy, with that buttery brown sugar flavor that makes oatmeal desserts so good.
I like that these stay tender even after they cool, and the texture is especially nice with old-fashioned oats. Chocolate chips are optional, but I think they’re a great match with the cinnamon (also optional, but worth it if you like that warm cookie flavor).
These are great for cookie trays, bake sales, or just a simple weekend dessert to keep on the counter. I usually cut them into smaller squares for snacking, but they’re also nice as bigger bars with coffee or milk.
Why You’ll Love This Recipe
Soft and Chewy: These bake up with set edges and a tender center, more like a thick oatmeal cookie than a dry bar.
One Bowl Friendly: You don’t need a mixer, and the batter comes together fast with melted butter.
Brown Sugar Flavor: That deep, buttery sweetness is the main thing I want in an oatmeal bar, and it really comes through here.
Easy to Slice: Once they’re fully cooled, you can lift the whole slab out and get clean cuts without crumbling.
Make It Your Own: Chocolate chips, nuts, dried fruit, or butterscotch chips all work well, so you can bake them how you like.
Ingredients You’ll Need
- All-purpose flour: I use regular flour here. It gives the bars structure so they slice cleanly and don’t fall apart.
- Baking soda: Don’t skip it. It helps the bars rise a bit and keeps the texture from getting heavy.
- Fine salt: This keeps the sweetness in check. Fine salt mixes in more evenly than coarse salt.
- Ground cinnamon (optional): I like adding it for that classic oatmeal cookie flavor. If you’re doing chocolate chips, cinnamon still works really well with them.
- Old-fashioned rolled oats: Use old-fashioned oats, not quick oats. This is where the chewiness comes from, and quick oats can make the texture a little pasty.
- Unsalted butter: Melted butter makes this easy, and it gives the bars that buttery cookie taste. Let it cool slightly so it doesn’t scramble the eggs.
- Light brown sugar: Brown sugar is the main flavor here. Dark brown sugar works too if you want a deeper molasses note.
- Granulated sugar: This helps the edges set and adds a little crispness around the outside.
- Eggs: These bind everything together and help the center bake up soft instead of crumbly.
- Vanilla extract: Vanilla makes the bars taste more like a real cookie. I use pure vanilla, but imitation works if that’s what you have.
- Semisweet chocolate chips (optional): Semisweet is my go-to here. Milk chocolate is fine too if you want them sweeter.
- Chopped walnuts or pecans (optional): Either one is good. I like chopping them fairly small so you get crunch without big hard bites.
Recipe Instructions
- Preheat the oven: Heat the oven to 350°F. Line a 9×13-inch pan with parchment paper and lightly grease it.
- Mix the butter and sugars: In a large bowl, whisk the melted (slightly cooled) butter with the brown sugar and granulated sugar until smooth.
- Add the eggs and vanilla: Whisk in the eggs and vanilla until the mixture looks glossy and well blended.
- Add the dry ingredients: Stir in the flour, baking soda, salt, and cinnamon (if using) just until you no longer see dry flour.
- Fold in the oats: Add the rolled oats and fold until they’re evenly mixed through the batter.
- Add the mix-ins: Fold in the chocolate chips and chopped nuts, if using.
- Spread the batter: Scrape the batter into the prepared pan, spread it out evenly, and press lightly to level the top.
- Bake: Bake for 20 to 25 minutes, until the edges are set and lightly browned and the center is just set.
- Cool and slice: Cool completely in the pan for clean cuts, then lift out with the parchment and slice into bars.
Some of my tips!
This is the part that really makes a difference. If you only read one section, make it this one because this is where I share the little trick that helps the recipe turn out so well.
Recipe Tips & Tricks
Don’t overbake them. Pull the pan when the edges look set and the center is just set. If you want extra chew, err on the side of slightly underbaked.
Cool them completely before slicing. Warm bars are more likely to bend and crumble when you cut them. Once cool, they slice cleanly and hold their shape.
Use old-fashioned oats. Quick oats make the bars softer in a different way, and the texture can turn a little mushy. Old-fashioned oats give you that classic chew.
Add a splash of milk if the batter seems dry. Oats can vary, and sometimes the dough looks a little stiff. One to two tablespoons of milk is usually enough to help it spread evenly.
Press the batter into the corners. The edges can bake up thinner if the batter isn’t spread evenly. I like to take a minute to make sure the corners are filled.
Make some touches!
There are plenty of easy ways to serve this depending on the occasion. Keep it simple, or add a few small touches to make it feel a little more special.
Serving Suggestions
- Milk: A cold glass of milk is classic with oatmeal bars. It’s especially nice if you add chocolate chips.
- Coffee or tea: These are really good with coffee, especially if you used cinnamon. Black tea or chai is also a good match.
- Ice cream: Serve a bar with vanilla ice cream on the side. If you want it warm, microwave a bar for a few seconds first.
- Fruit: Fresh berries are an easy side if you want something lighter on the plate. Sliced strawberries or raspberries are my favorites here.
Save it for later
This section covers how to store leftovers and what parts of the recipe you can prepare ahead of time.
Storage and Make Ahead
Store the bars airtight for up to 4 days. I usually keep them at room temperature if my kitchen is cool, but the fridge is fine too if you prefer a firmer bar.
If you refrigerate them, let a bar sit out for a few minutes before eating, or warm it briefly. They soften up quickly.
If you want them longer-term, freeze the bars for up to 2 months. I like freezing them in individual pieces so I can grab one or two at a time.
Thaw at room temperature for about 30 to 60 minutes, or thaw overnight in the fridge. They’re also fine straight from the freezer if you like a firmer, chewier bite.
A few quick answers
This section covers a few extra details that may help before you head to the recipe card.
Recipe FAQs
Can I use quick oats instead of old-fashioned oats?
You can, but the texture won’t be quite the same. Quick oats make the bars softer and less chewy, and the crumb can feel a little more “cakey” instead of hearty.
How do I know when oatmeal cookie bars are done?
I look for edges that are set and lightly browned, and a center that looks just set (not wet, but still soft). They’ll finish firming up as they cool in the pan.
Can I make these without chocolate chips?
Yes. They’re great as plain brown sugar oatmeal bars. If you want something else, raisins, dried cranberries, or butterscotch chips are easy swaps.
What if my batter seems too dry to spread?
Sometimes oats soak up more moisture depending on the brand and how packed your dry ingredients are. Stir in 1 to 2 tablespoons of milk, then try spreading again.
Can I freeze these cookie bars?
Yes, they freeze well. Freeze the sliced bars in an airtight container, then thaw at room temperature or in the fridge before serving.
You might also like
Before you go, take a look at a few other recipes below the recipe card. They use similar ingredients in a different way and are worth saving too.
MORE DINNER RECIPES TO TRY
Chewy Oatmeal Cookie Bars
INGREDIENTS
Dry Ingredients
- 1 1/2 cups all purpose flour
- 1 tsp baking soda
- 1/2 tsp fine salt
- 1 tsp ground cinnamon optional
- 3 cups old fashioned rolled oats.
Wet Ingredients
- 1 cup unsalted butter melted and slightly cooled
- 1 1/2 cups light brown sugar packed
- 1/2 cup granulated sugar
- 2 large eggs
- 2 tsp vanilla extract.
Mix Ins
- 1 1/2 cups semisweet chocolate chips optional
- 1/2 cup chopped walnuts or pecans optional.
INSTRUCTIONS
Prep
- heat oven to 350 F
- line a 9x13 inch pan with parchment and lightly grease.
Make Batter
- whisk melted butter with brown sugar and granulated sugar until smooth
- whisk in eggs and vanilla until glossy
- stir in flour baking soda salt and cinnamon just until combined
- fold in oats until evenly mixed
- fold in chocolate chips and nuts if using.
Bake And Cool
- spread batter evenly in prepared pan and press lightly to level
- bake until edges are set and lightly browned and center is just set 20 to 25 minutes
- cool completely in pan for clean cuts then lift out and slice into bars.
