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This Blackberry Baked Oatmeal is a simple oven-baked breakfast made with rolled oats, ripe banana, and juicy blackberries, lightly sweetened and baked until just set. It’s designed to be wholesome, approachable, and easy to make without any special ingredients or steps.
This is the kind of breakfast I like to make on weekends, for casual brunches, or on busy weeks when it helps to have something ready in the fridge. It reheats easily and works just as well for feeding everyone at once as it does for grabbing a slice over a few mornings.
Read This Before Starting
Here are a few helpful things to know before you start, so your baked oatmeal turns out soft, flavorful, and holds together well.
• Texture: This baked oatmeal is soft and spoonable in the center with lightly set edges, not crisp or crunchy throughout. It’s more set and less creamy than stovetop oatmeal, and meant to be scooped or sliced rather than stirred.
• Sweetness: This recipe is lightly sweet as written, but you can add a bit more brown sugar, maple syrup or honey if you prefer a sweeter breakfast.
• Effort level: Most of the prep happens in one bowl, and then you can walk away while the oven does the rest.
• Berries: Fresh or frozen blackberries both work well with no thawing required.
• Pan size: An 8-inch dish gives you thicker, softer slices, while a 9-inch dish bakes a little thinner and firmer and usually finishes about 10–15 minutes faster.
• Make-ahead friendly: This recipe holds up well for make-ahead breakfasts and reheats without drying out.
Ingredients You’ll Need
Here are the ingredients you likely already have in your pantry.
- Rolled oats form the base of the oatmeal bake and provide structure while still staying tender. Use old-fashioned rolled oats rather than quick oats for the best texture.
- Blackberries add natural sweetness and bursts of tart flavor. Fresh berries hold their shape slightly better, while frozen berries soften more and streak the oatmeal.
- Banana naturally sweetens the oatmeal and keeps the texture moist. A ripe banana with brown spots works best here.
- Milk helps hydrate the oats and create a soft, custardy interior. Any milk works, including dairy-free options.
- Brown sugar adds a subtle molasses note and rounds out the banana sweetness. The amount is intentionally modest since the banana adds natural sweetness.
- Cinnamon and salt balance the sweetness and bring warmth without overpowering the fruit.
How to Make Blackberry Baked Oatmeal
This recipe comes together easily with a few simple steps.
Step 1: Preheat the oven to 350°F and grease an 8- or 9-inch baking dish. An 8-inch dish will give you thicker, softer slices, while a 9-inch dish bakes a bit thinner and slightly firmer. Make sure the sides are well-greased so the oatmeal releases easily once baked.
Step 2: In a large bowl, whisk together the rolled oats, brown sugar, cinnamon, and salt until the dry ingredients are evenly mixed.
Step 3: In a separate bowl or large measuring cup, whisk the milk and mashed banana until mostly smooth, with no large banana chunks remaining. Pour the mixture over the oats and stir until all the oats are evenly moistened and the mixture looks thick and cohesive, not soupy.
Step 4: Gently fold in most of the blackberries, being careful not to crush them too much. Transfer the mixture to the prepared baking dish, spread it into an even layer, and scatter the remaining berries over the top. Sprinkle lightly with additional brown sugar if you like a lightly caramelized top.
Step 5: Bake for 40 to 50 minutes, until the center is set and no longer looks wet or jiggly when the pan is gently shaken. The edges should look slightly firm while the middle stays soft. Let the baked oatmeal rest for about 10 minutes before serving so it can fully set and slice cleanly.
Pro tip: If you use a 9×9 pan, the oatmeal will bake a little faster. Start checking for doneness about 10–15 minutes earlier.
Expert Tips and Variations
Here are the best tips and tricks to help your baked oatmeal turn out just right every time.
• Baking dish size: An 8×8-inch dish gives you thicker, softer slices and usually takes closer to 45–50 minutes. A 9×9-inch dish bakes a little thinner and will finish faster, so start checking around 35–40 minutes. To double the recipe, use a 9×13-inch pan and plan on about 45–55 minutes of baking time, checking the center for doneness.
• Berry swaps: Blueberries or raspberries can be used in place of blackberries with similar results.
• Sweeteners: You can replace the brown sugar with 2–3 tablespoons of maple syrup or honey if that’s what you have on hand.
• Chia seeds: You can add up to 1 tablespoon of chia seeds for a small nutritional boost without noticeably changing the flavor or texture.
• Add-ins: A sprinkle of sliced almonds, pecans, or toasted shreded coconut adds texture without overpowering the oats.
• Serving: Serve warm with yogurt, milk, or a drizzle of honey if desired.
Serving Ideas
This baked oatmeal is satisfying on its own, but a few simple additions can help turn it into a more complete breakfast or brunch spread.
• Serve with Greek yogurt or vanilla yogurt for extra creaminess.
• Add fresh fruit or citrus salad on the side.
• Pair with scrambled eggs or a quiche for brunch.
Storage and Reheating
If you’re making this ahead or saving leftovers, here’s how to store, freeze, and reheat it so it keeps its best texture.
Make-ahead: This baked oatmeal is a good option to bake on Sunday and portion out for weekday breakfasts.
Storing: Store leftover baked oatmeal in an airtight container in the refrigerator for up to four days. Keeping it covered helps prevent the edges from drying out.
Freezing: Cut the baked oatmeal into individual portions, then wrap tightly or place in freezer-safe containers. Freeze for up to two months for easy grab-and-go breakfasts.
Reheating: Reheat individual portions in the microwave with a splash of milk to restore moisture, heating in short intervals until warmed through. To reheat an entire pan, cover it loosely with foil and warm in a 325°F oven for about 15 minutes.
FAQs
These common questions cover a few final details that often come up when making baked oatmeal for the first time.
Yes. Frozen blackberries work well and do not need to be thawed. They soften as the oatmeal bakes and release juices that blend into the oats without changing the texture.
The center should be set and no longer jiggle when you gently shake the pan. A toothpick inserted into the middle should come out clean or with just a few moist crumbs.
This usually happens when there is too much liquid or when quick oats are used instead of old-fashioned rolled oats. Make sure the mixture looks thick before baking and stick with rolled oats for the best texture.
Yes. Let the oatmeal cool completely, then store it in the refrigerator for up to four days or freeze individual portions for up to two months. Reheat with a splash of milk to keep it soft.
More Oatmeal Recipes
If you enjoy baked oatmeal and other easy oatmeal recipes you can prep ahead, here are a few more you might want to try next.
- Baked Apple Oatmeal
- Baked Oatmeal Cups with Blueberries
- Blueberry Banana Baked Oatmeal
- Creamy Coconut Oatmeal
- Peach Cobbler Oatmeal
If you try this baked blackberry oatmeal, I’d love to hear how it turned out for you.
Blackberry Baked Oatmeal
Ingredients
- 2 cups whole rolled oats
- ¼ cup brown sugar, plus more for topping
- 1 teaspoon cinnamon
- ½ teaspoon kosher salt
- 1 cup milk, room temperature
- 1 ripe banana, mashed (~½ cup)
- 6 oz blackberries, fresh or frozen
Instructions
- Preheat the oven to 350F. Grease an 8- or 9-inch baking dish with cooking spray, and set aside.
- In a bowl, whisk together the oats, brown sugar, cinnamon, and salt until well combined. In a separate bowl or large measuring cup, whisk together the milk and mashed banana.
- Add the wet ingredients to the bowl of oats, stirring well to combine. Fold in most of the blackberries, scattering the rest on top of the mixture after you pour it into the baking dish. Sprinkle the top with a bit more brown sugar, if desired.
- Bake for 40-50 minutes, or until the middle is set. Remove from the oven and let cool for 10 minutes before serving.
Notes
- This recipe works best in an 8×8 or 9×9 pan. Double the recipe and use a 9×13 pan for a larger crowd.
- Fresh or frozen blackberries both work well. Frozen berries do not need to be thawed.
- Store leftovers in the refrigerator for up to four days or freeze individual portions for up to two months.
- Reheat individual portions with a splash of milk, or warm an entire pan covered with foil at 325°F for about 15 minutes.
- Want more details? Scroll up for step-by-step instructions, tips, and variations.
Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
