Lemon Blueberry Oatmeal Bake

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This lemon blueberry oatmeal bake is light and cake-like, and the perfectly healthy breakfast or have as an afternoon snack. It's loaded with juicy blueberries and fresh lemon zest and juice, giving it the ultimate blueberry lemon flavor. I love pairing it with Greek yogurt to add some protein and sprinkling additional blueberries on top or fresh berries on the side to make it a balanced meal or snack!

Some of my other favorite breakfast recipes include carrot cake oatmeal bars, pumpkin baked oats with a coffee yogurt sauce, cinnamon granola with pecans, and banana nut protein muffins!

a piece of lemon blueberry oatmeal bake topped with greek yogurt and lemon zest sitting on two plates.

If lemon and blueberry are one of your favorite combinations, you definitely need to add this baked oatmeal recipe to your breakfast rotation. It's one of the best breakfast meal preps because you can easily separate out individual portions to make for a quick breakfast. You can even make a double batch and freeze for another time!

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Equipment
Ingredients
How to Make Lemon Blueberry Baked Oatmeal
Variations & Substitutions
Pro Tips
Serving
Storage
Recipe FAQ
Other Recipes You May Like
Lemon Blueberry Oatmeal Bake

lemon blueberry oatmeal bake sliced on parchment paper with a small dish of lemon zest in the bottom right corner. blueberries, a knife, and plate with a piece of oatmeal around the bake.

Equipment

8x8" baking dish - this is what you'll bake the oatmeal in. It's the ideal size to get 9 pieces!
Small bowl - you want a small bowl to mix the dry ingredients in separately from the wet.
Large bowl - a 3- or 5-quart bowl is ideal for mixing the wet ingredients in because you'll then add the dry ingredients and fold in the blueberries. So you want enough space!
Whisk - this is ideal for mixing the dry ingredients as well as wet.
Rubber spatula - I love using a rubber spatula to fold in the blueberries to the batter. This will prevent most of the blueberries from bursting!
Parchment paper - lining the baking dish with parchment paper will prevent the lemon blueberry baked oatmeal from sticking to the pan. This parchment paper is great because it comes pre-cut and fits into this 8x8" baking dish perfectly if you cut it in half!

Ingredients

Full ingredients, measurements, and instructions can be found in the recipe card at the bottom of this post.

Old-fashioned oats (or rolled oats) - these are a staple ingredient in this recipe! They're a good source of fiber as well as B vitamins. Since they're a complex carbohydrate, this lemon blueberry oatmeal bake will keep us full all morning long. Especially if you pair it with a high quality protein like Greek yogurt! Please note that steel cut oats or instant quick oats will not bake the same and yield a different texture. If you are gluten-free, be sure to look for certified gluten-free oats.
Milk - any milk will work to add liquid to the recipe for the oats to soak up. You can use cow's milk, unsweetened almond milk, soy milk, oat milk, or any non-dairy milk of choice!
Unsweetened applesauce - applesauce adds moisture to baked goods without a lot of the fat and calories that can come from oils and butter. Plus it adds a hint of natural sweetness!
Pure maple syrup - I'm a big fan of using pure maple syrup as a natural sweetener in baking. While still an "added sugar," it's a lot less processed than granulated white sugar or brown sugar. Be sure to look for a maple syrup that just has "maple syrup" listed under the ingredients!
Fresh lemon juice - to get the ultimate lemon flavor, I high recommend using fresh lemon juice in this recipe!
Fresh lemon zest - lemon zest adds even more lemon flavor! Be sure to zest only the yellow part of the lemon. Once you get into the white rind, it can become bitter.
Olive oil - oils like olive oil are a good source of unsaturated fat (LINK) and a healthier alternative to butter and coconut oil. I recommend using classic olive oil and not extra virgin.
Eggs - eggs help to bind the oatmeal bake as well as add some protein!
Almond extract - almond extract adds such a beautiful subtle flavor to this oatmeal recipe. You can substitute pure vanilla extract if you'd like!
Baking powder - this will allow the blueberry lemon baked oatmeal to rise and give it a cake-like texture. Be sure to check the expiration date for optimal results!
Table salt - this balances out the sweetness of the this lemon baked oats recipe!
Blueberries - blueberries are a good source of fiber and antioxidants like anthocyanins, which help to fight inflammation! They're a powerhouse when it comes to nutrient and compliment the tart lemon flavor so well.

How to Make Lemon Blueberry Baked Oatmeal

dry ingredients for a lemon blueberry oatmeal bake.

1: Whisk the dry ingredients in a small bowl and set aside.

wet ingredients for a lemon blueberry oatmeal bake.

2: Combine wet ingredients (except blueberries) in a large mixing bowl. Whisk until mixed.

3: Pour the dry oat mixture into the large bowl with the wet ingredients and stir until combined.

lemon blueberry oatmeal bake batter with blueberries folded in.

4: Using a rubber spatula, fold in the fresh blueberries. Sprinkle extra blueberries on top if you want!

lemon blueberry oatmeal bake batter poured into an 8x8" baking dish lined with parchment paper.

5: Pour the oatmeal mixture into an 8x8" baking dish lined with parchment paper and sprayed with nonstick cooking spray.

lemon blueberry oatmeal bake in an 8x8" baking dish.

6: Bake at 350 degrees for 45-55 minutes, or until the edges are golden brown and the center is firm to the touch.

Variations & Substitutions

I haven't tried this but this recipe would be good made into oatmeal cups! These would be perfect for an easy grab-and-go snack or breakfast.
I would not substitute steel cut oats or instant quick oats in lieu of old-fashioned rolled oats, as they're different and will yield a different result!
White chocolate chips would be a great addition to this delicious baked oatmeal recipe!

Pro Tips

When zesting lemons (and citrus in general), be sure to zest only the yellow part of the lemon. Once you get into the white rind, it can become bitter.
Store-bought lemon juice will work but I highly recommend juicing fresh lemons!

a piece of lemon blueberry oatmeal bake topped with greek yogurt and lemon zest, and a fork taking a bite out of it.

Serving

I love serving this lemon blueberry oatmeal bake with low-fat Greek yogurt for extra protein (and some probiotics). You can also serve with a sprinkle of chia seeds, drizzle of nut butter, and fresh fruit!

Storage

Store this lemon bluberry baked oatmeal in an airtight container in the refrigerator for up to 5 days.
This recipe freezes really well too! I recommend wrapping individual portions in plastic wrap and then putting in an airtight container before freezing. It should freeze for up to 2 months!

lemon blueberry oatmeal bake with a small dish of lemon zest next to it and blueberries in the background.

Recipe FAQ

Are baked oats actually healthy?

It depends on what ingredients you use but these lemon blueberry baked oats are healthy! They're made with oats, olive oil, unsweetened applesauce, and more.

Why are my baked oats soggy?

They may not be cooked enough. I recommend cooking them until the edges are golden brown and the center is firm to the touch. You can also toast individual pieces in a toaster oven or air fryer to crisp it up a little bit!

Are baked oats good for digestion?

Yes! Oatmeal is a good source of both types of fiber (insoluble and soluble). These work together to help bulk up stool and keep it moving through our GI tract.