Blueberry Baked Oatmeal Casserole

There’s something truly comforting about starting your morning with a warm, aromatic Blueberry Baked Oatmeal Casserole. Imagine golden, lightly crisped oats on top with a soft, custardy center bursting with juicy blueberries. It’s a wholesome, heartwarming breakfast that tastes like dessert but nourishes like a power meal.

This baked oatmeal is a cozy cross between a breakfast casserole and a blueberry muffin — tender, slightly sweet, and full of goodness. It’s perfect for family breakfasts, weekend brunches, or meal prepping for the week ahead. You can serve it warm straight from the oven or enjoy it chilled — either way, it’s irresistibly satisfying.

Why I Love This Recipe

I absolutely love this recipe because it transforms ordinary oatmeal into something special. Instead of standing at the stove stirring, you simply mix the ingredients, bake, and let your kitchen fill with the sweet aroma of baked oats and berries.

It’s packed with nutritious ingredients — oats for fiber and slow energy, blueberries for antioxidants, eggs and milk for protein, and a touch of natural sweetness from maple syrup or honey. I love how versatile it is too — you can dress it up with nuts, fruits, or spices to suit any season.

Why It’s a Must-Try Dish

This Blueberry Baked Oatmeal Casserole is a must-try because it strikes the perfect balance between comfort and nutrition. It’s hearty without being heavy, sweet without being sugary, and wholesome without sacrificing flavor.

Unlike traditional oatmeal, this baked version feels like a special treat — ideal for gatherings, brunches, or even as a healthy dessert. It’s a dish that pleases both kids and adults alike, proving that nutritious food can taste indulgent.

Preparation and Cooking Time

• Preparation Time: 10 minutes
• Cooking Time: 35 minutes
• Total Time: 45 minutes

Servings and Nutrition

• Servings: 6
• Calories: Approximately 280 per serving

Course and Cuisine

• Course: Breakfast / Brunch
• Cuisine: American

Ingredients

Dry Ingredients:

• 2 cups old-fashioned rolled oats
• 1 teaspoon baking powder
• ½ teaspoon salt
• 1 teaspoon ground cinnamon

Wet Ingredients:

• 2 large eggs
• 2 cups milk (or any non-dairy alternative)
• ¼ cup maple syrup or honey
• 2 tablespoons melted butter or coconut oil
• 2 teaspoons vanilla extract

Fruits and Add-ins:

• 1 ½ cups fresh or frozen blueberries (do not thaw if frozen)
• Optional: ½ cup chopped nuts (walnuts, almonds, or pecans)

Optional Toppings:

• A sprinkle of brown sugar before baking
• Greek yogurt, extra blueberries, or honey for serving

Cooking Directions

1. Preheat the oven: Set your oven to 375°F (190°C) and lightly grease a 9x9-inch baking dish.
2. Combine dry ingredients: In a large bowl, mix oats, baking powder, salt, and cinnamon.
3. Mix wet ingredients: In another bowl, whisk together eggs, milk, maple syrup, butter, and vanilla extract.
4. Assemble the casserole: Spread half of the blueberries evenly on the bottom of the baking dish. Pour the oat mixture on top, then scatter the remaining blueberries over it.
5. Add liquid: Pour the wet mixture evenly over the oats and berries. Gently shake the pan to distribute everything evenly.
6. Bake: Place in the oven and bake for 35–40 minutes, or until the top is golden brown and the center is set.
7. Cool slightly: Let it rest for about 10 minutes before slicing.

Step-by-Step Preparation Method

Step 1: Preheat the oven and prepare your baking dish.
Step 2: Mix dry ingredients in one bowl (oats, baking powder, cinnamon, salt).
Step 3: Whisk wet ingredients in another bowl (milk, eggs, sweetener, butter, vanilla).
Step 4: Layer half the blueberries in the baking dish.
Step 5: Add oat mixture and top with remaining blueberries.
Step 6: Pour wet mixture evenly over everything.
Step 7: Bake until golden and set.
Step 8: Cool slightly before serving warm.

How to Serve This Recipe

Serve this delicious casserole warm, cut into squares or scooped into bowls. Drizzle with a little maple syrup or honey and top with a dollop of Greek yogurt or a splash of cream for extra indulgence.

It pairs wonderfully with a cup of coffee, tea, or a fresh fruit salad. It’s perfect for a cozy breakfast, weekend brunch, or even a healthy dessert after dinner.

Recipe Tips

• Use ripe blueberries for the best flavor and color.
• For extra creaminess, replace half of the milk with half-and-half or coconut milk.
• Sweetness level: Adjust maple syrup to taste; if you prefer sweeter oatmeal, add 1–2 tablespoons of brown sugar.
• Let it rest: Cooling for 10 minutes helps it firm up and makes slicing easier.
• Meal prep tip: Bake, cool, cut into squares, and store for grab-and-go breakfasts.

Variations

1. Apple Cinnamon Baked Oatmeal: Replace blueberries with diced apples and add ½ teaspoon nutmeg.
2. Mixed Berry Oatmeal: Combine blueberries, raspberries, and strawberries for a colorful version.
3. Banana Nut Oatmeal: Add sliced bananas and sprinkle chopped walnuts on top before baking.
4. Chocolate Chip Oatmeal: Stir in ¼ cup dark chocolate chips for a dessert-style twist.
5. Vegan Baked Oatmeal: Use flax eggs (2 tbsp flaxseed + 6 tbsp water) and plant-based milk.

Freezing and Storage

• Refrigeration: Store leftovers in an airtight container in the refrigerator for up to 5 days.
• Freezing: Freeze baked squares in individual portions for up to 2 months. Wrap each piece in plastic wrap and store in a freezer bag.
• Reheating: Warm in the microwave for 30–45 seconds or in a 350°F (175°C) oven for 10 minutes. Add a splash of milk if needed to soften.

Special Equipment Needed

• 9x9-inch (or similar) baking dish
• Mixing bowls (one large, one medium)
• Whisk
• Measuring cups and spoons
• Spatula or wooden spoon

Conclusion

Blueberry Baked Oatmeal Casserole is a perfect example of how wholesome ingredients can create something wonderfully indulgent. With its golden top, creamy interior, and bursts of juicy blueberries, it’s a feel-good dish that brings comfort and nutrition together beautifully.

It’s easy, customizable, and perfect for busy mornings or special brunches. Once you try it, this baked oatmeal will become a breakfast favorite that you’ll come back to again and again — warm, delicious, and full of love in every bite.