Chewy Oatmeal Brownies are my kind of brownie when I want something dense and fudgy with that little bit of extra chew you don’t get from a standard pan.
They’re rich and chocolatey from cocoa and melted chocolate, and the rolled oats make the squares feel sturdier and more satisfying. I also really like how this recipe gives you crisp edges while the center stays chewy.
For me, these are best for weekends, bake sales, and cookie trays when you want a brownie that holds up well and slices clean. They’re also great with a simple scoop of ice cream or just a glass of milk.
Why You’ll Love This Recipe
Soft and Chewy: The rolled oats give these brownies a chewy bite that feels a little more substantial than a classic brownie.
Deep Chocolate Flavor: Using both cocoa powder and melted chocolate makes the flavor come through strong without needing frosting.
Reliable in a 9×13: This is the kind of pan-brownie recipe I trust when I need neat squares for sharing.
Crisp Edges: You get that thin, crisp brownie edge around the pan, with a fudgy center that stays dense.
Easy Add-Ins: Walnuts and extra chocolate chips fit right in, but you can also keep them plain and they’re still excellent.
Ingredients You’ll Need
Brownie batter
- Unsalted butter: I like unsalted here so I can control the salt level. It also helps the brownies bake up rich and tender.
- Semisweet chocolate chips: Semisweet is my go-to for brownies because it tastes like “classic brownie” and doesn’t get too sweet.
- Granulated sugar: This brings the classic crackly top and helps the brownies set up the way you want in a bar recipe.
- Light brown sugar: Adds a little moisture and helps the texture stay chewy. Dark brown sugar works too if that’s what you have.
- Eggs: Eggs do the heavy lifting for structure. Use large eggs, and try to have them closer to room temp if you can.
- Vanilla extract: Don’t skip it. It makes the chocolate taste more rounded.
- All purpose flour: I use regular flour here. Measure it lightly so the brownies don’t get dry.
- Unsweetened cocoa powder: This is where a lot of the brownie flavor comes from, so use a cocoa you like the taste of.
- Baking powder: Just a little helps the batter lift enough so the squares aren’t heavy in a bad way.
- Fine salt: Salt makes the chocolate taste more like chocolate. If you only have kosher salt, use a little more.
- Old fashioned rolled oats: This is where the chewiness comes from. Quick oats change the texture a lot, so I stick with old fashioned.
Optional add ins
- Chopped walnuts: If you like a little crunch, walnuts are great here. I chop them pretty small so the bars slice cleanly.
- Chocolate chips: Extra chips make the brownies feel more loaded and extra chocolatey. Semisweet or dark both work.
Recipe Instructions
- Preheat the oven: Heat the oven to 350°F. Line a 9×13-inch pan with parchment paper and lightly grease it.
- Melt the chocolate: Melt the butter and semisweet chocolate chips together until smooth. Let the mixture cool for about 2 minutes so it’s not piping hot.
- Add the sugars: Whisk in the granulated sugar and brown sugar until the batter looks glossy.
- Add the eggs: Whisk in the eggs one at a time until fully mixed in, then whisk in the vanilla.
- Add the dry ingredients: Fold in the flour, cocoa powder, baking powder, and salt just until you don’t see dry streaks.
- Add the oats: Fold in the rolled oats, then stir in the optional walnuts and extra chocolate chips if you’re using them.
- Bake: Spread the batter evenly in the prepared pan. Bake for 25 to 32 minutes, until the center is set and a toothpick comes out with moist crumbs.
- Cool: Cool completely before slicing. This makes a big difference for clean, chewy squares.
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. If you want fudgier brownies, bake closer to the low end of the time range. A toothpick should come out with moist crumbs, not clean.
Use parchment paper. It’s the easiest way to lift the whole slab out and cut neat squares. It also helps if the edges get a little sticky.
Cool all the way before slicing. Warm brownies will slice messy, especially with oats and chocolate chips. I usually give them at least an hour on the counter.
Stir just until combined. Once the dry ingredients go in, stop mixing when you no longer see flour. Overmixing can make the brownies tougher.
Try a 9×9 for thicker bars. The brownies will be taller and need more time in the oven. Keep an eye on the center and use the toothpick test.
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 these. It’s especially good if you go heavy on the chocolate chips.
- Ice cream: Serve a square with vanilla ice cream on the side. If you want it warm, microwave a brownie for just a few seconds first.
- Fruit: Fresh berries are nice with a rich brownie like this. Strawberries and raspberries both work well.
- Coffee: These are really good with coffee, especially if you used dark chocolate chips or swapped in some dark chocolate.
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 brownies in an airtight container for up to 4 days. I usually keep them at room temperature if the kitchen isn’t warm. If it’s hot out, the fridge helps them hold their shape.
If you want to make this recipe ahead, bake the brownies the day before and leave them covered on the counter. They slice even cleaner the next day.
For longer storage, you can freeze sliced bars in a freezer-safe container. Let them thaw at room temperature, or thaw in the fridge overnight.
A few quick answers
This section covers a few extra details that may help before you head to the recipe card.
Recipe FAQs
How do I know when oatmeal brownies are done?
I look for set edges and a center that no longer looks wet. A toothpick in the middle should come out with moist crumbs, not raw batter.
Can I use quick oats instead of old fashioned rolled oats?
You can, but the texture will be different. Quick oats make the brownies a bit softer and less chewy, and the bars can feel more cake-like.
Can I use dark chocolate instead of semisweet?
Yes. I like swapping in dark chocolate for about half the chocolate chips when I want a deeper chocolate flavor.
Can I make these gluten free?
You can use certified gluten free oats, and you’ll need a gluten-free all purpose flour blend in place of regular flour. I’d stick with a 1:1 baking blend that’s meant for cookies and bars.
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 Brownies
INGREDIENTS
Brownie batter
- 170 g unsalted butter
- 200 g semisweet chocolate chips
- 300 g granulated sugar
- 100 g light brown sugar
- 3 large eggs
- 5 ml vanilla extract
- 95 g all purpose flour
- 50 g unsweetened cocoa powder
- 3 g baking powder
- 3 g fine salt
- 120 g old fashioned rolled oats.
Optional add ins
- 100 g chopped walnuts
- 50 g chocolate chips.
INSTRUCTIONS
Pan and oven
- heat oven to 350 F
- line a 9x13 inch pan with parchment and lightly grease.
Make batter
- melt butter and chocolate together until smooth then cool 2 minutes
- whisk in granulated sugar and brown sugar until glossy
- whisk in eggs one at a time then whisk in vanilla
- fold in flour cocoa baking powder and salt just until combined
- fold in oats and optional add ins.
Bake and cool
- spread batter evenly in pan
- bake until the center is set and a toothpick shows moist crumbs 25 to 32 minutes
- cool completely before slicing for clean chewy squares.
