If you love a breakfast that feels like a treat but still fuels your day, this High-Protein Baked Oatmeal is for you. Rolled oats, peanut butter, banana, and protein powder bake into tender, cake-like protein baked oats that are perfect for easy meal prep. Warm it up, add your favorite toppings, and enjoy a cozy, delicious start to the morning.
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Table of Contents
For more oatmeal recipes for breakfast, check out my Protein Oatmeal Breakfast Cookies, Cottage Cheese Overnight Oats, Creamy Oatmeal Smoothie, and Banana Oatmeal Muffins.
At A Glance: High-Protein Baked Oatmeal
- Prep Time: 10 minutes
- Cook Time: 35-40 minutes
- Total time: 50 minutes
- Makes: 12 slices
- Nutrition (per serving): 343 calories, 14 grams of protein, 5 grams of fiber
- What it Tastes Like: Cozy and lightly sweet with soft, cake-like oats, rich peanut butter, and hints of banana and vanilla.
- Why You'll Love It: Easy to make, great for meal prep, and filling enough to keep you satisfied all morning.
- Difficulty Level: Easy — one bowl and very forgiving.
Some mornings I want a cozy, comforting breakfast. Other mornings, I need something that will actually keep me full until lunch. This high-protein baked oatmeal checks both boxes — soft and cake-like, lightly sweetened with banana and maple syrup, and packed with protein from peanut butter, eggs, and protein powder.
This high-protein oatmeal bake is made for meal prep and real life. It comes together in one bowl, bakes in a single pan, and slices beautifully for easy breakfasts all week. I usually warm up a square and drizzle on extra peanut butter (because obviously), but it’s just as good with berries or yogurt when you want to mix things up.
If you’re loving high-protein baked oatmeal recipes lately, don’t miss my Brownie Baked Oatmeal and Pumpkin Baked Oatmeal.
Important Ingredients and Substitutions
Old-Fashioned Oats — Also called rolled oats, these give the baked oatmeal structure and a chewy, cake-like texture. Avoid quick oats or instant oats here; they break down too much and can make the oatmeal mushy. Use certified gluten-free oats if needed or high-protein oats (affiliate link) for an extra boost.
Milk — Adds moisture and helps everything bake up tender. Any kind of milk works here, including dairy milk or unsweetened almond milk, soy, or oat milk. For extra protein, use filtered milk (such as Fairlife).
Peanut Butter — Natural, drippy peanut butter blends best and adds healthy fats and flavor. Almond butter, cashew butter, or sunflower seed butter all work well as substitutes.
Peanut Butter Powder — Boosts protein and peanut flavor without extra fat. If you don’t have it, you can replace it with additional protein powder, use peanut butter-flavored protein powder, or leave it out and expect a slightly less protein-dense bake.
Protein Powder — Vanilla or unsweetened protein powder both work. If using a sweetened protein powder, reduce the maple syrup to ⅓ cup to keep the baked oatmeal from becoming too sweet. Whey, collagen, or neutral-flavored vegan protein powders are all good options.
Banana — Ripe bananas add natural sweetness and moisture. The spottier the peel, the better the flavor. If your bananas aren’t quite ripe, this recipe is forgiving — it’ll just be slightly less sweet.
Maple Syrup — Naturally sweetens the oatmeal and adds warmth. Honey or agave can be used in a pinch, though maple syrup gives the best overall flavor.
Eggs — Help bind the baked oatmeal so it slices cleanly and adds extra protein. For best results, use room-temperature eggs.
Chocolate Chips — Optional, but highly encouraged. Semi-sweet or dark chocolate chips both work, or swap in blueberries or raspberries for a fruit-forward version.
Recipe Variations
This high-protein baked oatmeal is endlessly customizable. A few easy swaps can totally change the flavor while keeping the same cozy, protein-packed base.
- Berry Protein Baked Oatmeal — Swap the chocolate chips for blueberries, raspberries, or a mixed berry blend for a bright, fresh twist. Frozen berries work great straight from the freezer.
- Chocolate Peanut Butter — Mix ¼ cup cocoa powder into the dry ingredients for a richer, dessert-style baked oatmeal that still totally works for breakfast.
- Nut-Free Option — Use sunflower seed butter instead of peanut butter and replace the peanut butter powder with extra protein powder to keep it allergy-friendly and protein-forward.
- Muffin-Style Protein Oats — Divide the batter into greased muffin tins and bake at 350°F for 22–25 minutes for portable, grab-and-go baked oatmeal cups.
How to Make High-Protein Baked Oatmeal
For the complete recipe and measurements, scroll to the recipe card at the bottom of this post.
Prepare: Preheat the oven to 350°F and lightly grease a 9×13-inch baking dish.
Step 1: In a large bowl, whisk together the milk, eggs, vanilla extract, mashed banana, peanut butter, and maple syrup until smooth and well combined.
Step 2: Add the oats, salt, peanut butter powder, and protein powder.
Step 3: Stir or whisk until the mixture is evenly combined and mostly smooth, with no large clumps.
Step 4: Pour the oatmeal mixture into the prepared baking dish and spread it evenly. Sprinkle the chocolate chips (or berries) over the top.
Step 5: Bake for 35–40 minutes, until the center is set and the edges are lightly golden and bubbling.
Let cool for 5–10 minutes before slicing. Serve warm, with extra peanut butter, melted chocolate, or your favorite toppings.
Chelsea's Recipe Pro-Tips
- Adjust the sweetness based on your protein powder. If you’re using vanilla or sweetened protein powder, reduce the maple syrup to ⅓ cup to keep the baked oatmeal balanced rather than overly sweet.
- Mix thoroughly to avoid clumps. Peanut butter powder and protein powder tend to clump when added to wet ingredients, so take an extra minute to stir well for a smooth, evenly baked oatmeal.
- Don’t overbake. Pull the oatmeal from the oven once the center is just set and the edges are bubbling — overbaking can dry it out and make it less tender.
- Let it rest before slicing. Allowing the baked oatmeal to cool for 5–10 minutes helps it set fully, resulting in cleaner slices and better meal-prep portions.
Storage Directions
- Refrigerating — Store slices in an airtight container in the refrigerator for up to 5 days.
- Freezing — Freeze individual slices in a freezer-safe container for up to 3 months. Defrost it overnight in the refrigerator or on low heat in the microwave before reheating.
- Reheating — Reheat slices in the microwave in 30–45 second intervals until warmed through.
Serving Suggestions
This high-protein baked oatmeal is hearty on its own, but it pairs beautifully with a little extra protein when you want a more filling breakfast. Try serving it with Cottage Cheese Scrambled Eggs, Millionaire Bacon, a cup of yogurt, or a Protein Coffee for an easy boost. For extra fruit, add a side of Winter Fruit Salad, fresh berries, or a simple banana.
High-Protein Baked Oatmeal FAQs
For an extra protein boost, use high-protein or protein-enriched oats and swap in filtered milk like Fairlife. You can also serve it with yogurt, cottage cheese, or a Mocha Protein Shake or Protein Green Smoothie to bump up the total protein without changing the recipe.
Yes! Use a non-dairy milk like almond or oat milk and choose a dairy-free protein powder. If adding chocolate chips, make sure they’re dairy-free as well.
Definitely. Whey, collagen, and neutral-flavored vegan protein powders all work well in this recipe. If your protein powder is sweetened or flavored, reduce the maple syrup to ⅓ cup to keep the baked oatmeal from becoming too sweet.
Yes. You can omit the protein powder and replace it with an additional ½ cup of old-fashioned oats. The baked oatmeal will still be delicious, just lower in protein.
Absolutely. This baked oatmeal is made for meal prep and keeps well in the fridge for up to 5 days or in the freezer for longer storage. Reheat individual slices as needed for easy breakfasts all week.
Yes. Divide the batter into greased muffin tins and bake at 350°F for 22–25 minutes, or until the centers are set. This is a great option for grab-and-go breakfasts.
This baked oatmeal gets its protein from four sources working together: eggs (6g per 3 eggs), natural peanut butter (7g per 2 tablespoons), peanut butter powder (8g per ¼ cup), and protein powder (20-25g per scoop depending on your brand). Combined, each slice delivers 14 grams of protein — significantly more than traditional baked oatmeal which typically has 4-6g per serving. Using high-protein oats or filtered milk like Fairlife can boost it even further.
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Recipe Card
High-Protein Baked Oatmeal
Equipment
Ingredients
- 1 ¾ cups milk dairy or non-dairy
- 3 large eggs brought to room temperature
- 1 ½ teaspoons pure vanilla extract
- 1 cup mashed overripe banana about 2 large ripe bananas
- ½ cup natural peanut butter smooth and drippy
- ½ cup pure maple syrup
- 3 cups old-fashioned oats rolled oats
- ½ teaspoon salt
- ½ cup peanut butter powder
- ½ cup protein powder vanilla or unsweetened; see notes
- ½ cup semi-sweet chocolate chips dark chocolate chips, or blueberries
Optional Peanut
- 2 tablespoons natural peanut butter
- 1 ¼ teaspoons coconut oil melted and divided
- 2 tablespoons semi-sweet chocolate chips
Instructions
- Preheat the oven to 350°F. Lightly grease a 9×13-inch baking dish with nonstick spray.
- In a large bowl, whisk together the milk, eggs, vanilla extract, mashed banana, peanut butter, and maple syrup until smooth and fully combined.
- Stir in the oats, salt, peanut butter powder, and protein powder. Whisk or stir well until no visible clumps remain and the mixture is evenly combined.
- Pour the oatmeal mixture into the prepared baking dish and spread evenly. Sprinkle chocolate chips on top. Bake for 35–40 minutes, until the center is set and the edges are lightly golden and bubbling.
- Transfer the pan to a wire rack and let cool for 5–10 minutes before slicing.
- Optional drizzle: Stir the peanut butter with 1 teaspoon of melted coconut oil until smooth. In a separate bowl, microwave the chocolate chips with the remaining ¼ teaspoon coconut oil in 20-second bursts, stirring between each, until melted and smooth. Drizzle both over the warm baked oatmeal and serve.
Notes
Recipe Pro-Tips
- Adjust the sweetness based on your protein powder. If using vanilla or sweetened protein powder, reduce the maple syrup to ⅓ cup so the high-protein baked oatmeal stays balanced rather than overly sweet.
- Mix thoroughly to prevent clumps. Peanut butter powder and protein powder tend to clump when added to wet ingredients; whisk well so the baked oatmeal sets evenly and slices cleanly.
- Melt the chocolate gently for drizzling. Use short microwave bursts and stir often to avoid overheating, which can cause the chocolate to seize.
Storage Directions
- Refrigeration: Store leftovers in an airtight container in the fridge for up to 5 days.
- Freezing: Freeze individual slices in a freezer-safe container for up to 3 months.
- Reheating: Warm servings in the microwave in 30–45 second intervals until heated through.
Common Variations
- Berry Protein Baked Oatmeal: Swap the chocolate chips for blueberries, raspberries, or a mixed berry blend for a fruit-forward protein oatmeal bake.
- Nut-Free Option: Use sunflower seed butter in place of peanut butter and replace the peanut butter powder with additional protein powder.
- Muffin-Style Protein Oats: Divide the batter into greased muffin tins and bake at 350°F for 22–25 minutes for portable, meal-prep-friendly baked protein oats.
Delicious breakfast, have made them several times!
Hi Jenna,
Yey! So glad to hear you like them. I always love having a pan of baked oats in the fridge, makes breakfast so much easier!
Thanks for reviewing and sharing,
Chelsea