Blackberry Baked Oatmeal with Frozen Berries (Single-Serve)

This Blackberry Baked Oatmeal made with frozen berries is the ultimate single-serve, cozy breakfast, and it takes just about 30 minutes to make. It’s minimally sweetened and packed with simple ingredients. As a dietitian, I love that it feels like eating dessert for breakfast, but gives you steady, long-lasting morning energy with 15 grams of protein and 7 grams of fiber.

Whether you’re making a quick breakfast for one, doubling it, or meal prepping a batch of ramekins for the week ahead, this single-serve baked oat recipe is about to become your new morning staple. I love it right out of the oven but it’s also great if you make ahead and eat cold the next morning. If you really want to elevate it, add a couple tablespoons of my lemon cream cheese drizzle on top!

For more healthy meal-preppable baked goods, these whole wheat blueberry muffins are a staples in our house – made with frozen wild blueberries.

Recipe Highlights

• Filling – With 15 grams of protein and 7 grams of fiber, this baked oatmeal keeps you satisfied all morning instead of leaving you hunting for a snack by 10am.
• Baked oats for one – No more dirtying a full 8×8 pan when you just want breakfast for yourself; or double the recipe and have enough for leftovers.
• Year-round – Frozen blackberries are always available, so you can make this in the dead of winter just as easily as peak summer.
• Minimally sweetened – A touch of natural sweetness lets the blackberries shine without tasting like dessert (well, unless you add the lemon cream cheese drizzle).
• Quick and Make-Ahead-Friendly – prepped and done in just 30 minutes. Bake a batch of ramekins on Sunday and grab one straight from the fridge all week; it’s just as good eaten cold as it is warm.

Ingredient Notes

• Old-Fashioned Rolled Oats: Provide the best hearty, chewy texture for baking. Quick oats work in a pinch, but steel-cut oats will not cook properly here.
• Frozen Blackberries: Frozen blackberries actually bake better than fresh ones! Their cell walls break down slightly during freezing, yielding juicy, bursting rivers of berry flavor throughout the oats.
• Egg: Binds the oats together and adds some high-quality protein.
• Milk: Dairy milk, almond milk, oat milk, or soy milk all work great.
• Brown Sugar: Just 1 tablespoon keeps this recipe minimally sweetened. Feel free to use maple syrup or coconut sugar if preferred.
• Avocado Oil or Melted Butter: Adds richness and healthy fats.
• All-Purpose Flour: A quick toss in flour coats the berries so they don’t sink to the bottom of your baker.
• Baking Powder, Cinnamon, Vanilla, & Salt: The essential flavor enhancers that make your kitchen smell like a bakery.

How to Make Single Serve Blackberry Baked Oatmeal

1. Preheat the oven to 350°F. Lightly grease an 8-ounce ramekin.
2. In a small bowl, whisk together the oats, sugar, baking powder, salt, and cinnamon.
3. In another bowl, whisk the egg, milk, vanilla, and avocado oil.
4. Stir the wet ingredients into the dry ingredients until combined.
5. Toss the frozen blackberries with the flour, then gently fold them into the batter.
6. Pour the mixture into the prepared ramekin. I love these single serving Souper Cube cassolettes.
7. Bake for 22-28 minutes, or until the center is set and the top is lightly golden.
8. Let cool for 5 minutes before serving.

If you blend up your oats, you can make baked oats that taste like dessert for breakfast with these Chocolate Baked Oats or my high-protein Nutella Overnight Oats. And easy breakfasts are always a win at our house, so we’ve been making this Microwave Protein Pancakes in a Bowl in a pinch. And we love overnight oats too: specifically this double chocolate protein oat recipe and these blueberry lemon overnight oats are a yummy hit!

Test Kitchen Tips

1. If your baked oatmeal is not set in the center, place it back in the oven for 5-10 minutes until it’s cooked through and golden on top.
2. Don’t thaw your berries. Keep them frozen right up until you toss them in flour and fold them in. Thawing releases excess liquid before baking, which will make your oats soggy.
3. Chop the blackberries: Chopping frozen blackberries ensures you get juicy berry bits distributed through every single bite.

1. Tossing frozen fruit in a teaspoon of flour helps suspend the fruit in the batter, keeping heavy pieces from sinking directly to the bottom.
2. Add 1–2 scoops of protein into the dry ingredients. I like  unflavored collagen powder because it dissolves seamlessly without changing the taste or texture. You can also mix in your favorite vanilla or unflavored protein powder (add an extra tablespoon of milk if using whey or plant-based protein powders, as they absorb extra moisture).

Serving Suggestions

• A warm drizzl eof almond butter, cashew butter, or peanut butter on top add healthy fats and a nutty richness.
• Or top your warm oats with a dollop of plain or vanilla Greek yogurt for creamy, extra protein.
• This bakes into a warm and cozy breakfast or snack right out of the oven, but it is equally delicious eaten cold out of the fridge later!
• If you’re feeling fancy, add the lemony cream cheese drizzle on top. It’s a simple combo of cream cheese, powdered sugar, and lemon juice that you can whip up while it bakes.

FAQs 

More Healthy Breakfast Recipes

• Peanut Butter Chocolate Overnight Oats with Greek Yogurt
• Blender Oatmeal Pancakes
• Healthy Chocolate Mousse with Greek Yogurt