There is something deeply satisfying about opening your fridge on a Tuesday morning and knowing breakfast is already sorted. That is exactly what this low sugar blueberry baked oatmeal for meal prep delivers. It bakes up in one dish on Sunday, slices into six generous portions, and keeps you fuelled with steady energy straight through to lunch. No scrambling, no skipping breakfast, no sugary cereal regrets. Just warm, wholesome oats waiting for you.
What makes this version genuinely different from most baked oatmeal recipes is the protein strategy. Greek yogurt goes directly into the batter alongside a whole egg and a scoop of unflavoured protein powder. That combination pushes each serving to around 14 grams of protein, which is a big deal for a grain-based breakfast. Protein slows down digestion, keeps blood sugar stable, and stops that mid-morning hunger crash before it starts. The oats themselves bring serious fibre, and a tablespoon of chia seeds stirred into the mix adds even more, along with a subtle pudding-like texture once baked. The total sugar sits at just 4 grams per serving, coming almost entirely from the blueberries themselves rather than any added sweetener. A small drizzle of pure maple syrup in the batter gives just enough warmth without spiking anything.
Blueberries do a lot of heavy lifting here, flavour-wise. Fresh or frozen both work beautifully, and frozen ones actually burst a little more during baking, creating gorgeous purple swirls throughout the oatmeal. A touch of cinnamon and a splash of vanilla extract round everything out so the finished dish tastes like something you would order at a good cafe, not something that came from a diet cookbook. The batter comes together in one bowl in about ten minutes flat. You stir the dry ingredients, whisk the wet ingredients separately, combine them, fold in the berries, and pour the whole thing into a lightly greased baking dish. The oven does the rest. You get to walk away, drink your coffee, and come back to a golden, bubbling, genuinely beautiful breakfast that your whole household will be excited about.
For meal prep specifically, this baked oatmeal is a dream. Once it cools completely, slice it into six squares and store them in airtight containers. Reheat a portion in the microwave for 60 to 90 seconds and it comes out soft, moist, and steaming. You can eat it plain, top it with a spoonful of almond butter, or add a few extra fresh blueberries on top for colour. It also pairs well with a side of plain Greek yogurt if you want to dial up the protein even further. The flavour actually deepens after a day or two in the fridge as the blueberry juices settle into the oats, making Wednesday's breakfast arguably better than Sunday's. If you have been searching for a breakfast that is genuinely healthy, genuinely low in sugar, and genuinely easy to stick with through a busy week, this is the one.
Ingredients
- 2 cups rolled oats (use certified gluten-free oats if needed)
- 1 scoop unflavoured whey protein powder (approximately 30g, or use a plant-based protein powder)
- 1 tablespoon chia seeds
- 1.5 teaspoons ground cinnamon
- 1 teaspoon baking powder
- 0.3 teaspoon fine sea salt
- 1 cup plain non-fat Greek yogurt (adds creaminess and protein)
- 1.5 cups unsweetened almond milk (or any low-calorie milk of choice)
- 1 large egg (helps bind the baked oatmeal)
- 1 tablespoon pure maple syrup (this is the only added sweetener)
- 1.5 teaspoons pure vanilla extract
- 1.5 cups blueberries (fresh or frozen both work, do not thaw if using frozen)
Instructions
- 1
Preheat your oven to 375 degrees Fahrenheit (190 degrees Celsius). Lightly grease an 8x8 inch baking dish with a small amount of coconut oil or non-stick spray and set it aside.
A glass or ceramic dish works best here as it distributes heat more evenly than metal.
- 2
In a large mixing bowl, combine the rolled oats, protein powder, chia seeds, cinnamon, baking powder, and salt. Stir well to evenly distribute all the dry ingredients.
Breaking up any protein powder clumps with a fork before adding the other dry ingredients saves you from getting lumps later.
- 3
In a separate medium bowl, whisk together the Greek yogurt, almond milk, egg, maple syrup, and vanilla extract until smooth and well combined.
If your Greek yogurt is thick, whisk the milk in gradually so everything blends without lumps.
- 4
Pour the wet ingredients into the dry ingredients and stir until everything is evenly combined. Let the mixture sit for two minutes so the oats and chia seeds can begin absorbing the liquid.
This short rest makes the final texture softer and more cohesive once baked.
- 5
Gently fold in one cup of the blueberries, reserving the remaining half cup for the top.
- 6
Pour the mixture into the prepared baking dish and spread it out evenly with a spatula. Scatter the remaining blueberries across the top.
Pressing the top berries in just slightly helps them stay in place and burst more beautifully during baking.
- 7
Bake uncovered for 38 to 42 minutes, or until the top is set and lightly golden at the edges and the centre no longer jiggles when you gently shake the dish.
Every oven runs differently, so start checking at 38 minutes. A toothpick inserted in the centre should come out mostly clean.
- 8
Remove from the oven and allow to cool in the dish for at least 10 minutes before slicing into six even squares. Serve warm or cool completely for meal prep storage.
Cooling fully before storing prevents condensation from building up in your containers, which keeps the texture better through the week.
Nutrition per serving
218kcal
Calories
14g
Protein
28g
Carbs
4g
Fat
5g
Fibre
4g
Sugar
185mg
Sodium
Pro Tips
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Frozen blueberries create beautiful purple swirls throughout the baked oatmeal as they burst during cooking. No need to thaw them first.
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Do not use quick oats here. Rolled oats give the best texture after baking and hold their structure well during reheating.
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If you prefer a softer centre, cover the dish with foil for the first 20 minutes of baking and uncover for the final 18 to 22 minutes.
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A spoonful of almond butter or a few extra blueberries on top when serving adds flavour and keeps things interesting through the week.
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This recipe doubles well. Use a 9x13 inch dish and increase the bake time by about 8 to 10 minutes.
Frequently Asked Questions
Variations
- •
Lemon Blueberry
Add the zest of one lemon to the wet ingredients and a teaspoon of lemon juice. The citrus brightens the blueberry flavour and gives the whole dish a fresher, more vibrant taste.
- •
Blueberry Almond Crunch
Scatter two tablespoons of sliced almonds over the top before baking for a light crunch. The almonds toast during baking and add a nutty contrast to the soft oats beneath.
- •
Vegan Version
Swap the egg for a flax egg (1 tablespoon ground flaxseed mixed with 3 tablespoons water, rested for 5 minutes), replace the Greek yogurt with a thick coconut yogurt, and use a plant-based protein powder. The texture will be slightly more dense but still delicious.
- •
Blueberry Banana
Mash one ripe banana into the wet ingredients before combining. This adds natural sweetness so you can omit the maple syrup entirely, and brings a creamier texture to the finished bake.
Substitutions
- •Almond milk → Oat milk or skimmed dairy milk (Any low-calorie milk works here. Oat milk adds a very slight natural sweetness. Full-fat coconut milk would make this richer but higher in calories.)
- •Plain non-fat Greek yogurt → Low-fat cottage cheese blended smooth (Blended cottage cheese creates a very similar texture and protein level. Make sure to blend it completely before using or you will get a lumpy batter.)
- •Maple syrup → Honey or a few drops of liquid stevia (Honey gives a slightly different flavour note but works well. Stevia will reduce the sugar even further if that is a priority for you.)
- •Unflavoured whey protein powder → Plant-based protein powder or collagen peptides (Both work well in this recipe. Avoid flavoured protein powders unless you want that flavour in the finished dish, as it comes through quite strongly after baking.)
- •Egg → Flax egg (1 tablespoon ground flaxseed plus 3 tablespoons water) (Rest the flax egg for at least 5 minutes before using so it thickens and gels properly. The baked oatmeal will be slightly less firm but still holds together for slicing.)
🧊 Storage
Cool completely before storing. Slice into 6 portions and place in individual airtight containers or store the whole dish covered tightly with cling film or a fitted lid. Refrigerate for up to 5 days. For freezing, wrap individual squares in cling film and store in a freezer bag for up to 2 months.
📅 Make Ahead
This recipe is designed specifically for meal prep. Bake it on Sunday and you have breakfast ready for the entire weekday stretch. The texture holds up beautifully in the fridge and the flavour deepens over the first couple of days. You can also prepare the dry and wet ingredient mixtures separately the night before, store them covered in the fridge, combine and bake in the morning to cut down on Sunday cooking time.
