Protein Baked Oats (Vegan, High-Protein, Meal Prep Friendly)

If you’re looking for a high-protein vegan breakfast that’s easy to prep, keeps you full, and tastes like a baked berry oatmeal bar, these protein baked oats are it. This recipe uses soy milk, vegan vanilla protein powder, and chia seeds to boost protein and make the texture more filling, while banana and berries add natural sweetness and moisture.

It’s a simple one-bowl baked oatmeal you can slice into squares and keep in the fridge for quick breakfasts or snacks all week.

Why you’ll love these protein baked oats!

• These are a delicious way to have a high-protein vegan breakfast (great for meal prep)
• We use basic pantry ingredients!
• It’s just mix and bake, so no blending required.
• It is super freezer-friendly and great for busy mornings
• This baked oats recipe is also highly customizable with any fruit, add-ins, or toppings

Ingredients you’ll need for these protein baked oats

• Banana: adds sweetness and helps bind the oats
• Soy milk: adds creaminess and extra protein (higher protein than most plant milks)
• Rolled oats: provides structure and chewy baked oatmeal texture
• Vegan vanilla protein powder: increases protein and makes it more filling
• Chia seeds: help thicken and add fiber and protein
• Lemon juice: brightens the flavor and balances the sweetness
• Salt: makes the vanilla and berries taste more pronounced
• Berries: adds freshness, color, and natural sweetness (fresh or frozen both work)

Best protein powder for baked oats

Not all protein powders bake the same. For the best results, use a vegan vanilla protein powder that mixes smoothly(pea + rice blends tend to bake well). If your protein powder is very thick or gritty, you may need a small splash of extra soy milk.

How protein powder affects texture

• Some brands absorb more liquid, which can make baked oats dry if the batter is too thick.
• If your mixture looks like stiff cookie dough instead of thick oatmeal, add 2-4 tablespoons more soy milk before baking.

How to make protein baked oats

Step 1: Mix wet ingredients

Mash the banana in a large bowl until mostly smooth, then add soy milk and lemon juice and stir well.

Step 2: Add dry ingredients

Add rolled oats, vegan vanilla protein powder, chia seeds, and a dash of salt. Mix until fully combined.

Step 3: Assemble

Pour into an 8×8-inch (20×20 cm) baking dish and flatten the top with the back of a spoon or spatula.

Step 4: Add berries

Scatter berries over the top and gently press them into the mixture so they don’t roll off after baking.

Step 5: Baking the oats

Bake at 350°F (175°C) for 30–40 minutes, until set in the center and lightly golden around the edges.

Let cool for 10–15 minutes before slicing for cleaner pieces.

Troubleshooting baked oats:

1. My protein baked oats are dry!

This usually means your protein powder absorbed more liquid than expected or the oats baked too long. Next time, add a splash more soy milk before baking. You can also reheat slices with a small splash of milk to soften them.

2. My baked oats are too soft or underbaked!

Bake a little longer and check the center. Ovens can vary a lot, and frozen berries can add extra moisture. Letting it cool also helps it set.

3. My protein baked oats taste chalky!

Some protein powders have a stronger taste when baked. Choose a smoother brand, or add a little more banana or berries to balance the flavor.

How to store protein baked oats?

• Storing it in the fridge: Store slices in an airtight container for up to 5 days.
• Saving it in the freezer: Freeze individual slices seperated by parchment paper and then in a ziplog bag or freezer-friendly stasher bags for up to 2 months. Thaw overnight in the fridge or microwave straight from frozen.

Best way to reheat:

Microwave a slice for 30–45 seconds and add a splash of soy milk. Top with yogurt, nut butter, or extra berries.

Variations and add-ins:

Chocolate Berry Protein Oats: Add 1–2 tablespoons cocoa powder, use chocolate protein powder insteaf of vanilla flavor, and use raspberries or cherries.

Make it peanut butter banana: Swirl 2–3 tablespoons peanut butter into the batter and top with sliced banana.

Add crunch: Add chopped walnuts, almonds, or pumpkin seeds on top before baking.

Other oats recipes from the blog:

• Butter Squash Baked Oats
• High Protein Overnight Oats – Three Flavors
• Peaches and Cream Overnight Oats
• Blueberry Lemon Baked Oats

Grab my Favorite Overnight Oats free PDF by clicking here (for more oatmeal ideas)