This blueberry muffin baked oatmeal with a crunchy streusel topping is a delicious, crowd-pleasing breakfast that bakes up in under an hour. Serve it warm for brunch, portion it for easy weekday breakfasts, or freeze individual slices for grab-and-go mornings. The flavor and texture are true to a blueberry muffin—moist, tender, and dotted with juicy berries—while providing whole grains and fruit in every serving.
Blueberry Muffin Baked Oatmeal
This baked oatmeal captures everything you love about a blueberry muffin—without the fuss of individual baking. It’s soft and cake-like from the oats and oat flour, naturally sweetened with banana and honey, and brightened by fresh blueberries. The streusel on top adds a buttery, crunchy contrast that makes every bite delightful.
Baked oatmeal is a way to prepare oats by combining rolled or quick oats with wet ingredients like eggs and milk, then baking the mixture so it sets into a muffin- or cake-like dish. The final texture is heartier than a smoothie or porridge but still soft—perfect topped with nut butter, honey, yogurt, or extra fruit.
Why you’ll love it!
Healthy breakfast: This recipe combines fruit, whole grains, and healthy fats for a balanced start to the day.
Make ahead or feed a crowd: Bake one pan to serve multiple people, or prepare and freeze portions for quick breakfasts all week.
Kid friendly: It tastes like a blueberry muffin, so it tends to be popular with children and adults alike.
Featured Ingredients
Streusel topping
- Quick-cooking oats and oat flour: The streusel is built on a mix of quick oats and oat flour to create structure and a tender crumb.
- Light brown sugar: Adds warm, caramel-like sweetness that pairs perfectly with blueberries.
- Cold unsalted butter: Using cold butter and cutting it into the dry ingredients produces that signature crumbly streusel texture.
- Vanilla extract: A little vanilla brightens the streusel; almond extract is an optional swap for a different aroma.
Baked oatmeal
- Banana: Mashed banana adds moisture and natural sweetness while keeping the bake soft.
- Eggs: Provide structure and help the oats set into a firm, sliceable bake.
- Honey and vanilla: A touch of honey and vanilla rounds out the sweetness along with the banana and berries.
- Unsweetened oat milk: Any dairy-free milk will work if you prefer an alternative.
- Quick-cooking oats and oat flour: The combination yields tender, muffin-like results. Use certified gluten-free oats to keep the recipe gluten-free.
- Blueberries: About 2 cups (a pint) gives plenty of fruity bursts; fresh is best, but properly handled frozen blueberries can work too.
How to Make Blueberry Muffin Baked Oatmeal
Prepare the streusel topping
Combine quick oats, oat flour, light brown sugar, cold unsalted butter, and vanilla in a bowl. Use a spoon or your fingers to press and cut the butter into the dry ingredients until coarse crumbs form. This takes a few minutes; set the streusel aside while you make the batter.
Combine the wet ingredients
In a large bowl, mash a very ripe banana until smooth and slightly liquid. Whisk in the eggs, vanilla, honey, and oat milk until evenly combined and silky.
Add the dry ingredients
Stir in the quick oats, oat flour, baking powder, and a pinch of salt. Gently fold in the blueberries so they are evenly distributed without bursting too many.
Swap the blueberries
If you prefer a different fruit, substitute raspberries, blackberries, or chopped strawberries. Frozen berries are fine—thaw and drain any excess liquid before folding them into the batter to avoid excess moisture.
Bake
Transfer the batter to a 9×9-inch baking dish lined with parchment or lightly sprayed. Sprinkle the streusel evenly over the top. Cover the dish and bake at 375ºF for about 30 minutes, then remove the cover and bake an additional 10 minutes until the center is set and the topping is golden.
Cool and serve
Let the baked oatmeal rest for about 10 minutes before slicing. Serve warm on its own, with a dollop of yogurt, a drizzle of nut butter, or a splash of milk for a comforting breakfast.
FAQs
Stored in an airtight container in the refrigerator, baked oatmeal will keep for about 3–5 days. For longer storage, cool completely, wrap individual portions tightly, and freeze for up to 3 months.
Yes. Rolled oats can be used in place of quick oats; the texture will be slightly heartier. If using rolled oats, ensure the oats are fully mixed and the bake has enough liquid and time to set.
Oatmeal is rich in whole grains and fiber, which helps you feel fuller longer and supports sustained energy through the morning. Baked oatmeal offers an easy, portable way to enjoy those benefits while adding fruit and protein.
Storage
Refrigerate leftover baked oatmeal in an airtight container for up to five days. To freeze, cool completely, wrap individual slices tightly in foil or plastic wrap, remove as much air as possible, and store in the freezer for up to three months. Thaw overnight in the refrigerator or reheat gently in the microwave.
Tips & Notes
- If you don’t have oat flour, all-purpose flour or white whole wheat can be used instead.
- Any unsweetened plant milk such as almond milk can replace oat milk if needed.
- Substitute raspberries or blackberries for blueberries for a different flavor profile.
- When using frozen blueberries, thaw and drain them first to avoid adding extra moisture to the batter.
Nutrition
Calories: 354 kcal, Carbohydrates: 57 g, Protein: 7 g, Fat: 12 g, Fiber: 5 g, Sugar: 34 g. (Nutrition information is estimated and should be used as a guideline.)
Photography credit: photos taken for this recipe by Ashley McGlaughlin.