Fudgy Brownie Baked Oatmeal

This brownie baked oatmeal is a warm, chocolatey breakfast that tastes like dessert. It’s a one-bowl recipe that comes together fast with oats, cocoa, and banana.

A crisp, almost brownie-like top gives way to a soft, fudgy center underneath. No refined sugar here, just the natural sweetness of ripe bananas and a little maple syrup.

Why This Baked Oatmeal Tastes Like a Brownie

It’s the cocoa powder that does the heavy lifting, Dutch process gives the richest flavor. The banana adds moisture and helps keep the middle soft, while the edges bake up with that chewy, brownie-like texture you want.

The batter comes together in one bowl and needs no blender. I love that I can mix it while the oven heats, and within half an hour I have a breakfast that feels like a treat.

Ingredients

• 2 cups rolled oats: old-fashioned oats give the best chewy texture
• 1/4 cup unsweetened cocoa powder: Dutch process for a deep chocolate flavor
• 1 tsp baking powder
• 1/2 tsp fine sea salt
• 1 cup mashed banana: about 2 medium, the spottier the sweeter
• 1/4 cup pure maple syrup: adds a gentle caramel note
• 1 large egg: or a flax egg for a vegan version
• 1 tsp vanilla extract
• 1 1/2 cups milk: any dairy or unsweetened non-dairy milk works
• 1/3 cup chocolate chips: semi-sweet, plus extra for topping

Variations / Substitutions

• Swap the oats: quick oats work in a pinch, but reduce the milk by 2 tbsp to keep the texture from getting mushy
• Swap the sweetener: honey or date syrup can replace the maple syrup in the same measurement, though the flavor will shift slightly
• Make it vegan: use a flax egg (1 tbsp ground flax + 3 tbsp water) and your favorite plant-based milk
• Go nut-free: skip the nut butter drizzle later and top with seed butter or extra chocolate chips
• Add crunch: fold in a handful of chopped toasted walnuts or pecans with the chocolate chips

If you’re in the mood for a fruitier baked oatmeal, try my Blueberry Lemon Baked Oatmeal.

How to Make Brownie Baked Oatmeal

Step 1: Whisk the Dry Ingredients

Preheat your oven to 350°F (175°C) and lightly grease an 8×8-inch baking dish. In a large bowl, whisk together the 2 cups rolled oats, 1/4 cup cocoa powder, 1 tsp baking powder, and 1/2 tsp salt until evenly combined.

The cocoa will coat the oats and look a little dusty at first, that’s what you want. Give it a few good whisks so there are no hidden pockets of white baking powder.

Step 2: Mash and Whisk the Wet Mixture

In the same bowl, make a well in the center and add the 1 cup mashed banana, 1/4 cup maple syrup, 1 large egg, 1 tsp vanilla, and 1 1/2 cups milk. Whisk everything together until the mixture is mostly smooth, a few small lumps of banana are fine and will disappear as it bakes.

The batter should look glossy and pour easily off the whisk. If your banana was on the larger side and the batter feels a little thick, add an extra splash of milk.

Step 3: Fold the Batter Together

Pour the wet mixture right over the dry and stir with a spatula until no dry streaks remain. Fold in the 1/3 cup chocolate chips, scraping the bottom of the bowl to catch any stubborn oat clumps.

The batter will be thick but pourable, and you’ll see the chocolate chips begin to dot the surface. That’s your signal to stop stirring, overmixing here can make the baked oatmeal tough.

Step 4: Spoon and Drizzle with Nut Butter

Scrape the batter into the greased dish and spread it into an even layer. Bake for 25 to 28 minutes, until the center is set and a toothpick inserted comes out with a few moist crumbs clinging to it. Let the dish cool on a rack for about 5 minutes, then spoon generous portions into bowls. Drizzle each serving with a little warm peanut butter or almond butter and scatter a few extra chocolate chips on top so they melt from the heat.

The top will crackle slightly as it cools, and the middle stays soft and pudding-like underneath. Serve while it’s still warm, and watch the chocolate chips turn melty.

Tips for the Fudgiest Brownie Oatmeal

• Grab bananas with lots of brown spots, they mash up sweeter and smoother and let you cut back on added sweetener
• Let the baked oatmeal rest for at least 10 minutes if you want clean slices, but spooning it out while hot gives the most decadent texture
• Stash leftovers right in the baking dish, covered, and reheat individual portions in the microwave for a quick breakfast all week
• Swap the chocolate chips for chopped dark chocolate if you want deeper, less sweet pockets throughout

Bake times by dish size:

A toothpick should come out with a few moist crumbs, not wet batter, in either pan.

Storing Leftover Brownie Oatmeal

Refrigerate: Cool completely, then cover the dish or transfer to an airtight container. It keeps well for up to 4 days.

Reheating: Microwave individual portions for 45 to 60 seconds with a damp paper towel draped over the bowl to keep it from drying out. You can also warm it in a 300°F oven for about 10 minutes.

What to Serve with Brownie Baked Oatmeal

A cold, tangy spoonful of plain yogurt on top cuts through the chocolate richness and feels like a grown-up version of chocolate pudding. Fresh raspberries or sliced strawberries add bright, juicy contrast. A simple pour of cold milk over your bowl is classic and lets the fudgy texture soften even more.

Frequently Asked Questions

Can I use quick oats instead of rolled oats?

Yes, but the texture will be softer and less chewy. Reduce the milk by 2 tablespoons to keep it from turning mushy.

How do I make this completely vegan?

Replace the egg with a flax egg (1 tablespoon ground flaxseed mixed with 3 tablespoons water) and use a non-dairy milk like oat or almond. The maple syrup is already plant-based.

Can I double the recipe for a larger group?

Absolutely. Use a 9×13-inch baking dish, keep the ingredient ratios the same, and bake for 30 to 35 minutes, checking at the 30-minute mark.

Can I freeze baked oatmeal?

Yes. Cut the cooled oatmeal into individual squares, wrap tightly, and freeze for up to 2 months. Thaw overnight in the fridge and reheat as usual.

Brownie Baked Oatmeal Recipe

Print Recipe Pin Recipe

Prep Time 10 minutes mins

Cook Time 25 minutes mins

Total Time 35 minutes mins

Servings: 4 servings

Calories: 340

Ingredients Method Notes

Ingredients

  

• 2 cups rolled oats
• 1/4 cup unsweetened cocoa powder
• 1 tsp baking powder
• 1/2 tsp fine sea salt
• 1 cup mashed banana (about 2 medium)
• 1/4 cup pure maple syrup
• 1 large egg
• 1 tsp vanilla extract
• 1 1/2 cups milk
• 1/3 cup chocolate chips

Method

 

1. Preheat oven to 350°F (175°C) and grease an 8×8-inch baking dish. In a large bowl, whisk together oats, cocoa powder, baking powder, and salt.
2. Make a well in the dry ingredients and add mashed banana, maple syrup, egg, vanilla, and milk. Whisk until mostly smooth.
3. Pour the wet mixture into the dry and fold together with a spatula until no streaks remain. Fold in the chocolate chips.
4. Scrape batter into the prepared dish and bake for 25 to 28 minutes, until the center is set and a toothpick comes out with moist crumbs. Let cool 5 minutes, then spoon into bowls and drizzle with nut butter and extra chocolate chips.

Notes

The baked oatmeal will puff up slightly in the oven and settle as it cools. For a firmer, sliceable texture, let it rest for a full 10 to 15 minutes before serving.