Breakfast casseroles are such lifesavers, especially when you’re practically running out the door with kids in tow. Just pop them in the oven and reheat once you’re ready to eat. This heart-healthy brown sugar blueberry baked oatmeal never disappoints and is full of essential nutrients, too!

How to Make Blueberry Baked Oatmeal

It’s super easy to make this easy breakfast casserole from scratch thanks to this recipe:

  • Preheat the oven. Preheat your oven to 350℉.
  • Prepare the dry ingredients. Add the rolled oats, ½ cup of chopped pecans (or walnuts), dark brown sugar, ground cinnamon, baking powder, ground nutmeg and salt to a bowl and stir to combine.
  • Prepare the wet ingredients. Add the milk, eggs, melted butter and pure vanilla extract to a separate bowl and mix to combine.
  • Prepare the blueberries. In a separate bowl, add either fresh or frozen blueberries and flour and toss to combine.
  • Add some of the blueberries. Add two cups of blueberries to a lightly greased baking dish.
  • Add the oat mixture. Pour the oat mixture over top of the blueberries.
  • Finish it off. Top with the remaining blueberries and chopped pecans or walnuts.
  • Bake. Bake the oatmeal casserole in the preheated oven for 45 to 55 minutes (or until set).
  • Serve. Serve the brown sugar blueberry baked oatmeal casserole warm.

Blueberry Baked Oatmeal

Blueberry Baked Oatmeal

Blueberry Baked Oatmeal

Blueberry Baked Oatmeal

(Also try: Healthy Blueberry Oatmeal Muffins)

3 Easy to Remember Tips for Baking Oatmeal

Here are a few handy tips to keep in mind when baking oatmeal to help you avoid some of the most common mistakes:

  • Make sure to add eggs. Adding a few eggs in with your oatmeal will help it to rise properly as it’s baking. Even just one single egg can help improve the texture of your oatmeal.
  • Use rolled oats. Stick with rolled oats when making baked oatmeal unless you want your oatmeal to turn out overly mushy.
  • Grease the baking dish. I like to use a 10 inch pan that has been lightly greased with olive oil spray or butter when making baked oatmeal recipes to help prevent the oatmeal from sticking to the pan.

Blueberry Baked Oatmeal

Rolled Oats vs. Instant Oats — Which is Better?

One of the most common oatmeal related questions that we get is which is the better choice between rolled oats and instant oats. The truth is that both oats can provide you with some stellar health benefits – but rolled oats are generally considered to be slightly better… Here are a couple of reasons why:

  • Higher fiber content. Rolled oats tend to have a higher dietary fiber content compared to instant oats. This is great because fiber helps to lower cholesterol and reduce your risk of type 2 diabetes and heart disease. (1)
  • Better texture. Rolled oats tend to produce an oatmeal that has a thicker texture, while instant oats can easily end up overly mushy or soggy.

Blueberry Baked Oatmeal

More Blueberry Breakfast Ideas:

  • Blueberry Coffee Cake with Crumble Top
  • Sheet Pan Blueberry Pancakes
  • Blueberry Scones with Lemon Drizzle
  • Fluffy Blueberry Buttermilk Pancakes
  • 5 from 1 vote

    Brown Sugar Blueberry Baked Oatmeal (Easy Breakfast Casserole)

    Prep Time: 15 minutes
    Cook Time: 45 minutes
    Total Time: 1 hour
    Servings: 6


    • 2 cups old-fashioned rolled oats
    • 2 large eggs
    • 1 ⅔ cups milk
    • 1 cup pecans or walnuts, chopped
    • cup dark brown sugar
    • 2 tsp ground cinnamon
    • 1 tsp baking powder
    • ¼ teaspoon ground nutmeg
    • ½ teaspoon salt
    • 1 tsp vanilla extract
    • 3 tbsp butter, melted
    • cups blueberries, fresh or frozen
    • 2 tsp flour


    • In a bowl add the rolled oats, ½ cup of pecans, brown sugar, cinnamon, baking powder, nutmeg and salt and stir to combine
    • In another bowl add the milk, eggs, melted butter and vanilla extract. 
    • Add the wet ingredients to dry ingredients and mix to combine. 
    • In another bowl add the blueberries and flour and toss to combine. 
    • Add 2 cups of blueberries to a lightly greased baking dish. 
    • Pour the oat mixture over the blueberries. 
    • Top with remaining blueberries and pecans. 
    • Bake in preheated oven for 45-55 minutes or until set.
    Like this recipe?Leave a comment and review below!

    Emma Kelly

    Lover of smoosh faced dogs, cooking (of all kinds), spending as much time as I can in the garden (especially with homegrown veg and cut flowers), and diy’ing everything! Make sure to follow me on Pinterest for more easy meals, (mostly) healthy desserts and crave-worthy snacks. Learn more about me here.

    This post contains affiliate links (I love sharing my favorite ingredients and cooking equipment with you all!)

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      1. Will be adding the nutrition info to all recipes very soon :)

        And I like topping this baked oatmeal with either homemade whipped cream or coddled cream. So yummy! Anything creamy works though.