10-Minute Microwave Brownie Baked Oatmeal

I used to think baked oatmeal was one of those things you had to plan ahead for—you know, the kind of breakfast that requires setting your alarm early and actually using your oven. Then one morning I was craving something chocolate-y and filling, but I only had about five minutes before I needed to be out the door.

That’s when I realized my microwave could do way more than reheat coffee. Turns out, you can make baked oatmeal in there, and it comes out just as good as the oven version. Better yet, when you add cocoa and chocolate chips, it tastes like you’re eating brownies for breakfast—which, let’s be honest, is exactly what we all want on a Tuesday morning.

What Kind of Oats Should I Use?

For this microwave brownie baked oatmeal, old-fashioned rolled oats are your best bet since they hold their shape and give you that classic oatmeal texture. Quick oats will work in a pinch, but they tend to get a bit mushier and won’t give you quite the same hearty bite. I’d avoid steel-cut oats for this recipe since they need a much longer cooking time and won’t soften properly in the microwave. If you need a gluten-free option, just make sure to grab certified gluten-free oats, as regular oats are often processed in facilities that handle wheat.

Options for Substitutions

This quick breakfast is easy to customize with what you have in your pantry:

• Oats: Stick with regular rolled oats for this recipe – quick oats will get too mushy, and steel-cut oats won’t soften enough in the microwave.
• Agave: You can swap agave with honey, maple syrup, or even regular sugar (use 1 ½ tablespoons if using granulated sugar). Each will give you a slightly different sweetness level.
• Oat milk: Any milk works here – dairy, almond, soy, or coconut milk will all do the job just fine.
• Chocolate chips: Feel free to use dark, milk, or semi-sweet chocolate chips depending on your preference. You could also chop up a chocolate bar or use cacao nibs for less sweetness.
• Cocoa powder: Regular unsweetened cocoa powder is best, but Dutch-processed cocoa will work too. Just don’t skip it – it’s what gives you that brownie flavor.
• Egg: For a vegan version, try using 1 tablespoon of ground flaxseed mixed with 2 ½ tablespoons of water. Let it sit for 5 minutes before mixing into your oats.

Watch Out for These Mistakes While Baking

The biggest mistake with microwave baked oatmeal is overcooking it, which happens fast since microwaves vary in power – start checking at 45 seconds and add time in 10-second intervals if needed, because even 15 extra seconds can turn your brownie oatmeal dry and rubbery.

Make sure to grease your bowl really well (or use a microwave-safe mug instead) since the chocolate and egg mixture loves to stick, making cleanup a nightmare and wasting half your breakfast.

Don’t skip blending the oats into a flour-like consistency, as whole oats won’t cook evenly in such a short time and you’ll end up with crunchy bits mixed with gooey spots.

Let it cool for at least a minute before digging in – the center will be extremely hot and continue cooking slightly as it sits, plus this resting time helps the texture firm up to that perfect brownie-like consistency.

What to Serve With Brownie Baked Oatmeal?

This brownie baked oatmeal is pretty filling on its own, but I love topping it with a dollop of Greek yogurt or a spoonful of peanut butter for extra protein to keep me full until lunch. Fresh berries like raspberries or sliced strawberries add a nice tartness that balances out the chocolate sweetness. If you’re feeling indulgent, a drizzle of almond butter or a scoop of vanilla ice cream turns this breakfast into a legit dessert. A glass of cold milk or a hot cup of coffee on the side makes it feel like a complete meal.

Storage Instructions

Store: If you happen to have leftovers (though that’s rare with something this good!), you can keep your brownie baked oatmeal in an airtight container in the fridge for up to 3 days. It’s actually pretty tasty cold, kind of like a fudgy oatmeal bar.

Make Ahead: You can mix the dry ingredients together the night before and store them in a small container. In the morning, just add the wet ingredients, stir, and microwave. It saves a couple minutes when you’re rushing out the door!

Reheat: Pop it back in the microwave for about 30-45 seconds to warm it up. You might want to add a splash of oat milk before reheating to keep it from drying out.

Estimated Nutrition

Estimated nutrition for the whole recipe (without optional ingredients):

• Calories: 400-450
• Protein: 8-10 g
• Fat: 12-15 g
• Carbohydrates: 65-75 g

Ingredients

• 1/2 cup oats (I always use Quaker Old Fashioned oats)
• 3 tbsp chocolate chips (semi-sweet or dark for a rich brownie flavor)
• 1 1/2 tbsp agave
• 2 tbsp oat milk (I prefer Oatly for its extra creamy texture)
• 1 1/2 tbsp cocoa
• 1 egg
• 1/2 tsp baking powder
• 1/4 tsp salt
• 1/4 tsp vanilla extract

Step 1: Prepare the Brownie Batter

• 1/2 cup oats
• 1 1/2 tbsp cocoa
• 1/2 tsp baking powder
• 1/4 tsp salt
• 1/4 tsp vanilla extract
• 1 egg
• 1 1/2 tbsp agave
• 2 tbsp oat milk

Combine the oats, cocoa powder, baking powder, salt, and vanilla extract in a blender or food processor.

Pulse until the oats are partially broken down but still slightly textured—you want some oat pieces remaining for a better texture in the final dish.

Add the egg, agave, and oat milk, then blend until you have a smooth, thick batter with no dry flour streaks.

I like to use a blender here because it creates a creamier base than hand-mixing, which makes the oatmeal feel more cake-like rather than chunky.

Step 2: Cook in the Microwave

• brownie batter from Step 1

Lightly grease a microwave-safe bowl or mug (about 12-16 oz capacity) with a small amount of oil or cooking spray to prevent sticking.

Pour the batter from Step 1 into the prepared bowl and spread it evenly.

Microwave on high for 45-60 seconds, starting with 45 seconds and checking for doneness—the top should look set but still slightly moist, and a toothpick inserted in the center should come out mostly clean with a few moist crumbs.

The batter will rise slightly and be tender when fully cooked.

Step 3: Finish and Serve

• 3 tbsp chocolate chips

Remove the cooked oatmeal from the microwave and let it cool for 1-2 minutes—this allows it to set slightly without becoming dry.

Sprinkle the extra chocolate chips on top while still warm so they soften slightly.

I find that adding the chocolate chips after cooking keeps them from burning and gives you little pockets of melted chocolate throughout.

Serve immediately in the bowl or turn it out onto a plate if you prefer.

10-Minute Microwave Brownie Baked Oatmeal

Delicious 10-Minute Microwave Brownie Baked Oatmeal recipe with step-by-step instructions.

Print Recipe Pin Recipe

Prep Time 5 minutes mins

Cook Time 5 minutes mins

Total Time 10 minutes mins

Servings 1 serving

Calories 425 kcal

Ingredients

  

• 1/2 cup oats (I always use Quaker Old Fashioned oats)
• 3 tbsp chocolate chips (semi-sweet or dark for a rich brownie flavor)
• 1 1/2 tbsp agave
• 2 tbsp oat milk (I prefer Oatly for its extra creamy texture)
• 1 1/2 tbsp cocoa
• 1 egg
• 1/2 tsp baking powder
• 1/4 tsp salt
• 1/4 tsp vanilla extract

Instructions

 

• Combine the oats, cocoa powder, baking powder, salt, and vanilla extract in a blender or food processor. Pulse until the oats are partially broken down but still slightly textured—you want some oat pieces remaining for a better texture in the final dish. Add the egg, agave, and oat milk, then blend until you have a smooth, thick batter with no dry flour streaks. I like to use a blender here because it creates a creamier base than hand-mixing, which makes the oatmeal feel more cake-like rather than chunky.
• Lightly grease a microwave-safe bowl or mug (about 12-16 oz capacity) with a small amount of oil or cooking spray to prevent sticking. Pour the batter from Step 1 into the prepared bowl and spread it evenly. Microwave on high for 45-60 seconds, starting with 45 seconds and checking for doneness—the top should look set but still slightly moist, and a toothpick inserted in the center should come out mostly clean with a few moist crumbs. The batter will rise slightly and be tender when fully cooked.
• Remove the cooked oatmeal from the microwave and let it cool for 1-2 minutes—this allows it to set slightly without becoming dry. Sprinkle the extra chocolate chips on top while still warm so they soften slightly. I find that adding the chocolate chips after cooking keeps them from burning and gives you little pockets of melted chocolate throughout. Serve immediately in the bowl or turn it out onto a plate if you prefer.