High-Protein Baked Oatmeal You Can Bake Once and Slice All Week

Regular oatmeal means standing at the stove every single morning — high-protein baked oatmeal means doing it once. Blend, stir, bake — and you’ve got 8 squares with 20 grams of protein each, ready to reheat for busy mornings without a pot in sight. For more make-ahead mornings like this one, check out our full High-Protein Breakfast Meal Prep roundup.

Why You’ll Love This Recipe

• High-protein baked oatmeal with 20g of protein per serving — more staying power than a bowl of regular oatmeal.
• One dish, one bake — no morning stovetop stirring required.
• Feeds a crowd or a whole week — this high-protein baked oatmeal yields 8 squares from a single 9×13-inch dish.
• Naturally sweet — no sugar rush needed to make it taste good.

Ingredients Overview

High-protein baked oatmeal gets its protein boost from a blended mix of cottage cheese, eggs, and protein powder poured right over the oats before baking, so the finished squares stay moist instead of dry. According to Harvard T.H. Chan School of Public Health, rolled oats are also a good source of fiber, which pairs well with a protein-forward breakfast to help keep you full longer.

Fresh blueberries fold in for bursts of sweetness, while cinnamon and maple syrup round out the flavor without needing a sugary topping. Every ingredient here is easy to find at a regular grocery store, so there’s no special shopping trip required.

Step-by-Step Instructions

Follow these simple steps to make your High-Protein Baked Oatmeal from start to finish:

1. Preheat your oven to 350°F and grease a 9×13-inch baking dish with cooking spray.
2. In a blender, combine the cottage cheese, eggs, protein powder, milk, maple syrup, vanilla extract, and salt, and blend until smooth.
3. In a large bowl, stir together the rolled oats, baking powder, and cinnamon.
4. Pour the blended mixture over the oats and stir until fully combined, then fold in the blueberries.
5. Pour into the prepared dish and bake for 35-40 minutes, until set and golden on top, then let cool for 10 minutes before slicing.

💡 Pro Tip: Let your high-protein baked oatmeal cool completely before slicing, so the squares hold together instead of crumbling.

Meal Prep & Storage Tips

High-protein baked oatmeal keeps its texture well, which makes it one of the easiest recipes in this silo to batch for the week. Sealed in an airtight container, it keeps in the fridge for up to 5 days, or in the freezer for up to 2 months. Reheat a square in the microwave for 45-60 seconds from the fridge, or closer to 90 seconds from frozen.

If you’re prepping for the whole week, slice the cooled dish into 8 squares and store them in individual containers so grabbing breakfast takes zero thinking on a rushed morning. A quick drizzle of extra maple syrup after reheating brings the flavor right back.

Variations & Substitutions

Swap the blueberries for diced apple and extra cinnamon for a fall-flavored version of this high-protein baked oatmeal, or stir in a tablespoon of cocoa powder and mini chocolate chips for a treat that still counts as breakfast. Dairy-sensitive? Cottage cheese can be swapped for an equal amount of Greek yogurt without changing the texture much. For a nut-free version, double-check your protein powder brand, since some are processed in facilities with tree nuts.

FAQ

Can I double this High-Protein Baked Oatmeal recipe? Yes — use two baking dishes and rotate them halfway through baking for even cooking. It’s an easy way to stock the freezer for two weeks instead of one.

Why blend the wet ingredients instead of just mixing them in? Blending the cottage cheese and eggs first keeps the finished bake smooth instead of leaving visible curds throughout. According to Harvard T.H. Chan School of Public Health, pairing a fiber-rich food like oats with a protein source is a simple way to build a more balanced breakfast.

Can I assemble this the night before? Yes — mix everything together, pour it into the baking dish, cover, and refrigerate overnight. Bake straight from the fridge in the morning, adding a few extra minutes to the bake time.

Do I need to thaw a frozen square before reheating? No, you can microwave a high-protein baked oatmeal square straight from frozen — just add an extra minute or so to the reheating time compared to a fridge-stored one.

Can I use steel-cut oats instead of rolled oats? Not for this recipe — steel-cut oats need more liquid and a longer bake time to soften properly, so stick with old-fashioned rolled oats for the best texture.

Ready to Meal Prep?

High-protein baked oatmeal turns one Sunday bake into a full week of grab-and-go mornings, with zero extra cooking in between. Craving more high-protein recipes? Subscribe to our newsletter for weekly meal prep inspiration! 📩

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• High-Protein Overnight Oats
• High-Protein Pancakes
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