Healthy Lemon Blueberry Baked Oatmeal – Gluten Free!

Blueberry lemon baked oatmeal is an easy make-ahead breakfast you’ll want to keep in rotation. It’s a true one-bowl recipe made with wholesome ingredients – kid-approved too! You’ll love how easy these berry baked oats are.

Healthy Lemon Blueberry Baked Oatmeal – Gluten Free!

I love making a big batch of baked oatmeal at the beginning of the week. It sets me up for breakfast success and simplifies mornings.

This blueberry lemon version is extra delicious, too! The blueberries are juicy and bursting in every bite, and the lemon adds a fresh lemon flavor that pairs perfectly with the berries.

The recipe, similarly to my zucchini baked oatmeal, is not overly sweet, which is how I like to make my baked oats. You can always add a drizzle of maple syrup or honey on the top if you’re looking for extra sweetness, though.

And the toppings are endless! It’s amazing on its own, but you should also try adding a little Greek yogurt and peanut butter drizzle on it, and then come back and try telling me that’s not your new favorite baked oats topping.

So good!

Why you’ll love this baked oatmeal recipe

Juicy blueberries + bright lemon flavor – Blueberries and lemon pair so well together. When it’s blueberry season, make sure you put this recipe on your must-make list!

Perfect for meal prep – Baked oatmeal will last all week long, making it a great recipe to prep in advance. 

Kid-friendly – The kids love a sweet breakfast recipe, and this one hits the spot! I love that once I get it into the oven, it’s hands-off cooking and makes a lot of baked oatmeal. I love keeping baked oatmeal in the breakfast rotation for that reason!

Simple ingredients you need for blueberry baked oats

Scroll down to view the recipe card below for the full ingredients list, nutrition facts, and step-by-step instructions.

• ripe banana (or unsweetened applesauce)
• eggs
• unsweetened almond milk
• avocado oil
• pure vanilla extract
• fresh lemon zest
• lemon juice
• old fashioned oats
• turbinado sugar
• baking powder
• sea salt
• fresh blueberries

How to make lemon blueberry oatmeal bake

Step 1: Preheat the oven to 375 degrees F. Oil an 8×8 square baking dish, or line it with parchment paper.

Step 2: In a large bowl, mash the banana (or add the applesauce). Next, add the wet ingredients (eggs, milk, oil, vanilla, lemon zest, and lemon juice), and mix until well combined. Lastly, add the dry ingredients (rolled oats, sugar, baking powder, and salt), giving it a quick stir, then folding in 1 cup of blueberries.

Step 3: Pour into the prepared baking dish and sprinkle the remaining 1/2 cup of blueberries on the top, then bake in the preheated oven for 40-45 minutes, or until the center of the baked oats is set and the edges are golden brown. Use a toothpick to check doneness – when inserted into the center, it should come out clean or with a dry crumb.

Step 4: Allow the baked oats to cool before cutting into and serving. It can be enjoyed warm or at room temperature. Top with a little greek yogurt and additional blueberries or your favorite toppings!

​Try this other variation

Instead of baking a large casserole dish, you can also bake individual oatmeal cups. Grease 6-8 2-cup round glass dishes and add the oat mixture, then bake until set. It will take less time, about 20-25 minutes.

You can also bake the oatmeal mixture in a muffin tin for smaller, more snack-sized individual servings.

Allow the individual portions to cool before storing them in the fridge, and then reheat as needed throughout the week in the oven, toaster oven, or microwave!

How to store

Leftover baked oatmeal will last 5-7 days in the fridge when stored properly.

Be sure to allow the baked oatmeal to cool fully before covering it tightly with plastic wrap or adding it to an airtight container.

Warm the entire baking dish or individual pieces in the oven, microwave, or air fryer to add crispy edges as it heats up.

Substitutions, optional variations & dietary adjustments

Below you’ll find a list of substitutions that will work well in this healthy lemon blueberry baked oatmeal recipe. 

If you try something different out, please leave a comment below letting us all know how it turned out!

Banana – Banana will add natural sweetness, but to avoid any banana flavor, you can substitute 1/2 cup apple sauce (for less sweet), or 1/2 cup pure maple syrup (for a sweeter version).

Eggs – Egg whites will work in place of whole eggs. You can also make a flax egg or chia seed egg to replace 1 or 2 of the eggs.

Unsweetened almond milk – Use your favorite non-dairy milk of choice, or even regular milk.

Old fashioned oats – Quick oats can work in place of rolled oats, however, it will change the texture a bit. I do not suggest using steel cut oats.

Turbinado sugar – Brown sugar, coconut sugar, or natural cane sugar are all good substitutes.

Lemon zest/lemon juice – Orange or lime would be delicious alternatives!

Blueberries – Try this recipe with other berries or fresh fruit!

More healthy breakfast recipes you’ll love

• High protein overnight oats
• Chocolate protein baked oatmeal
• Peanut butter baked oats

If you try this blueberry lemon baked oats recipe, I’d love it if you left a star rating and comment below letting me know how it turned out!

XO

Heather

Originally published April 2014. Updated July 2025.