4.83 from 108 votes

Protein Baked Oatmeal

Enjoy your morning oats and pack in the protein with this delicious protein baked oatmeal! It’s a simple recipe that’s ideal for meal prep, delivering over 17 grams of protein in every serving to keep you fueled all day.

One of the most common questions I hear about baked oatmeal is, “Can I add protein powder to baked oatmeal?” The answer is yes! But I wanted to go a step further and create a recipe where protein is the star—enter, protein baked oatmeal.

Oatmeal alone doesn’t always keep me full, especially after an hour or so, because it’s a little light on protein. That’s why I always love boosting it up with protein and healthy fats to keep hunger away and mornings satisfying.

After sharing plenty of protein overnight oats and stovetop protein oatmeal recipes, I’m excited to say that this protein baked oatmeal might be my new top pick for a hearty, protein-packed start to the day.

Enjoy your oatmeal and boost your protein with this easy protein baked oatmeal! It’s quick to put together, great for prepping ahead, and offers over 17 grams of protein per serving.

Instructions

• Preheat your oven to 375°F and grease an 8-inch square baking dish with cooking spray.
• In a large bowl, whisk together oats, protein powder, almond milk, peanut butter, eggs, maple syrup, coconut oil, vanilla, and salt until just combined.
• Fold in the blueberries gently, then pour the mixture into your prepared baking dish. Add extra blueberries on top for a pretty finish.
• Bake for 35-40 minutes until the center is set and a toothpick comes out mostly clean. Let it cool a few minutes before slicing. Serve with a drizzle of your favorite nut butter.

Nutrition

Serving: 1/6 slice | Calories: 313kcal | Carbohydrates: 37g | Protein: 17g | Fat: 13g | Saturated Fat: 4g | Monounsaturated Fat: 1g | Cholesterol: 60mg | Sodium: 272mg | Potassium: 94mg | Fiber: 4g | Sugar: 11g

Nutrition information is automatically calculated and is an estimate only.

Equipment

• 8-inch Baking Dish (my go-to size for baked oatmeal)

If you love this recipe, please rate and leave a comment below — I love hearing from you!

This protein baked oatmeal is a quick, make-ahead way to turn regular oats into a hearty, protein-packed breakfast. It’s basically proats—oats plus protein powder—combined with nut butter and simple pantry staples, baked all in one dish.

Here’s a quick snapshot of what you’ll find in this post:

• Hands-on prep takes just about 10 minutes with a 35-minute bake time, serving 6 people for a total of roughly 45 minutes.
• Each slice packs around 17 grams of protein, and you can easily make it gluten-free, dairy-free, or vegan with easy swaps.
• A clear ingredient list and step-by-step directions, along with tips for mix-ins, ingredient switches (like eggs to flax eggs or frozen fruit), and an option for a blended baked oatmeal if you like a smoother texture.
• Hints on meal prep and storing leftovers so you can bake ahead, freeze portions, and reheat easily on busy mornings.

Keep reading for the full recipe, helpful tips, serving ideas, and answers to common questions so you can tweak this protein baked oatmeal to fit your needs.

Why You’ll Love It

• Simple and fuss-free, all you need is one bowl and one baking dish.
• Perfect for quick breakfasts on busy mornings or grab-and-go days—and if you want another meal-prep option, try High Protein Egg Bites.
• Gluten-free, dairy-free, and easy to make vegan if you want—see Vegan Breakfast Bowls for another high-protein plant-based breakfast idea.

• Delivers a solid 17 grams of protein per serving to keep you energized.

Ingredients You’ll Need

• 2 cups old fashioned rolled oats
• ½ cup vanilla protein powder, I used Sun Warrior
• 2 cups unsweetened almond milk, or any dairy-free milk
• ¼ cup peanut butter, or any nut butter
• 2 large eggs, or flax eggs
• 3 Tablespoons maple syrup
• 1 Tablespoon coconut oil, melted
• 1 teaspoon vanilla
• ¼ teaspoon salt
• ½ cup fresh blueberries, plus more for topping
• nut butter, for drizzling on top

How to Make It

1. Preheat oven to 375°F and grease an 8-inch square baking dish with cooking spray or line it with parchment.
2. In a large bowl, whisk together oats, vanilla protein powder, almond milk, peanut butter, eggs, maple syrup, melted coconut oil, vanilla extract, and salt until just combined (do not overmix).
3. For a smoother texture, blend all ingredients except the berries until smooth, then stir in the berries.
4. Gently fold in the blueberries.
5. Pour the mixture into the prepared baking dish and scatter extra blueberries on top.

6. Bake at 375°F for 35–40 minutes, or until the center is set and a toothpick comes out mostly clean.

   

7. Let the baked oatmeal cool 15–20 minutes until firm, then slice.

Tips for Best Results

Here are some down-to-earth tips to make sure your protein baked oatmeal turns out perfectly every time and tastes just how you want it.

• Measure your liquids precisely. Too much milk can make your baked oatmeal soggy. If your batter feels really loose, cut back on milk by a tablespoon or two.
• Adjust for different protein powders. Not all protein powders behave the same. Plant-based ones often soak up more liquid, while some whey blends can give a denser texture. If the batter seems thick, add a splash of milk; if too thin, mix in extra oats.
• Mix only until combined. Don’t overmix—that can make the texture rubbery or tough instead of light and tender.
• Use frozen berries straight from the freezer. This helps keep berry juices from bleeding too much into the oats. Fold them in gently to keep them from sinking.
• Mind your pan and baking time. Metal pans bake faster than glass ones. Start checking at 30 minutes with a toothpick; it should come out mostly clean. If the top browns too quickly, tent it with foil.
• Cool before slicing. Let the baked oatmeal sit for 15-20 minutes so it firms up for nice clean slices. Individual portions reheat well too if you’re pressed for time.
• Use parchment or a good nonstick spray. This helps prevent sticking and keeps cleanup super easy.
• Adjust sweetness and mix-ins thoughtfully. Vanilla protein powder adds sweetness, so taste before adding more maple syrup. Nuts, chocolate chips, or shredded coconut are delicious but add sparingly to keep good texture. Craving a fall twist? Try our high-protein pumpkin baked oatmeal for a cozy variation.
• Vegan swaps. For vegan eggs, try flax or chia eggs, but expect a slightly softer texture. Adding an extra tablespoon of oats can help make it firmer.
• Freeze in single servings. Slice before freezing, wrap portions individually, and reheat just what you need. Use the microwave or oven for a quick warm-up. For more meal-prep pointers, see our easy make-ahead high protein baked oatmeal.

These little tips will help you customize your protein baked oatmeal to your taste and avoid sogginess or uneven baking.

Mix-Ins, Swaps, and Pairings

This baked oatmeal already packs fiber, healthy fats, and 17 grams of protein per serving, so you can enjoy it on its own or pair it with something else for a well-rounded breakfast. Here are some ideas to try:

• Something savory: Try baked egg muffins, high-protein dairy-free egg bites, or a crustless quiche like spinach or kale with feta.
• A fresh fruit salad: A simple mix or one with fresh mint adds a bright contrast.
• Breakfast meats or alternatives: Regular bacon, tempeh bacon, chicken or veggie sausages all work great.
• Yogurt bowls: A side of yogurt adds creaminess and extra protein.

• Protein powder: I like plant-based vanilla protein powder for this, but feel free to use your favorite. Whey or hemp protein might work, but I can’t say for sure since I haven’t tried them in this recipe. If protein powder isn’t an option, check out my other 22+ baked oatmeal recipes without protein powder.
• Nut or seed butter: Swap peanut butter with almond, cashew, tahini, or sunflower seed butter if needed.
• Eggs: Use flax eggs or chia eggs for a vegan version instead of regular eggs.
• Sweeteners: Maple syrup is my top pick, but honey, agave, or monk fruit sweeteners all work.
• Fruit: Fresh blueberries are my favorite, but strawberries, raspberries, cherries, or blackberries all add a nice touch. You can skip fruit and use chocolate chips or chopped nuts instead if you prefer.
• Blended baked oatmeal: If you prefer a smoother texture, toss all the ingredients (except berries) into a blender and blend until smooth. Stir in the berries last, then bake!

Storage, Reheating, and Freezing

Planning ahead is key in busy households, and this protein baked oatmeal is perfect for that. Prefer a no-bake make-ahead breakfast? Try High Protein Pumpkin Overnight Oats. Here are a couple of ways to prep it ahead of time:

OPTION 1: BAKE AND REHEAT LATER

1. Bake the oatmeal as directed. Once cooled, cover the baking dish tightly and refrigerate for 1-2 days. When ready to eat, reheat covered in a 350°F oven for about 20 minutes. For a quick fix, warm individual slices in a toaster oven for 5-10 minutes or microwave for 1 minute.

OPTION 2: PREP AHEAD AND BAKE IN THE MORNING

1. Mix all dry ingredients in a large bowl, cover, and leave out overnight.
2. Combine wet ingredients in a separate bowl, cover, and refrigerate overnight.
3. In the morning, mix wet and dry ingredients together, pour into your baking dish, and bake as usual.

This recipe stores well in both the fridge and freezer, making meal prep a breeze.

In the fridge: Keep in an airtight container for up to 4-5 days.

In the freezer: Slice, wrap portions individually in plastic wrap, then place in a freezer bag. It keeps well for 3 months. This makes reheating just what you need super easy. For another freezer-friendly breakfast bake, check out this High-Protein Breakfast Casserole.

Reheating a whole pan: Cover with foil and warm at 350ºF for 20 minutes or until hot all the way through.

Reheating individual slices: Use a toaster oven at 350ºF for 5-10 minutes, or microwave for 1 minute. Add your favorite toppings and dive in!

Frequently Asked Questions

What’s the best protein powder to use?

I used Sun Warrior vanilla for this recipe, but Nuzest is another top pick of mine, especially for plant-based options. If you want to explore protein powders more in-depth, I have a detailed guide on the best choices out there.

Why add protein powder to oatmeal?

Oatmeal is often low in protein, so it can leave you hungry shortly after eating. Adding protein powder and healthy fats makes breakfast more filling and satisfying. The vanilla protein powder I use also adds natural sweetness and flavor.

Can I swap rolled oats for steel cut or quick oats?

You can, but each oat variety needs different liquid amounts and baking times. For steel cut oats, I recommend using a recipe specifically designed for them, like my baked steel cut oatmeal recipe.

My baked oatmeal turned out soggy. What went wrong?

This recipe yields a softer baked oatmeal, but it shouldn’t be overly soggy. Usually, too much milk or insufficient baking time causes sogginess.

Is it okay to bake with protein powder?

Absolutely! Baking with protein powder is a fantastic way to boost nutrition and keep meals filling. I bake with protein powder all the time—try my Protein Pumpkin Muffins for a snack-worthy example—and have lots of recipes featuring it here at Eating Bird Food.