You will love this recipe for Lemon Blueberry Baked Oatmeal Cups if you want something fast, pretty, and actually satisfying in the morning. These are lightly sweet, bright with lemon, packed with juicy blueberries, and they bake right in a muffin tin for built-in portion control. They are perfect for those mornings when you need a grab-and-go option that still feels a little special; they also dress up beautifully for a Mother’s Day brunch or as part of your Easter brunch ideas.
These baked oatmeal cups freeze well and you can reheat them in seconds. I love that they taste like a cozy lemon blueberry muffin, but with the heartiness of oatmeal so you actually stay full. If you are always searching for quick breakfast ideas that are pretty enough for company, this will become a new favorite.
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Ingredients for Lemon Blueberry Baked Oatmeal Cups
- 2 1/2 cups old-fashioned oats
- 1 teaspoon baking powder
- 1 teaspoon cinnamon (optional, but so good)
- 1/4 teaspoon salt
- 2 large eggs (room temperature if possible)
- 1 ½ cups milk (room temperature if possible)
- 1/4 cup melted butter or coconut oil
- 1/3 cup maple syrup or honey (or 1/2 cup packed brown sugar)
- 1 teaspoon vanilla extract
- Zest of 1 large lemon
- 2 tablespoons lemon juice
- 1 1/2 cups blueberries (fresh or frozen; no need to thaw)
- Optional: 2 tablespoons chia seeds to help the cups hold together
Optional lemon glaze:
- 1 cup powdered sugar
- 1 to 2 tablespoons lemon juice
How to Make Lemon Blueberry Baked Oatmeal Cups
1. Prep your pan and oven
Heat your oven to 350°F. Line a muffin tin with liners, or grease it really, really well so the oatmeal doesn’t stick.
2. Stir together the dry ingredients
In a large mixing bowl, add: Old-fashioned oat, baking powder, cinnamon (if using), salt and chia seeds (if using). Stir until everything looks evenly combined.
3. Whisk the wet ingredients
In a separate medium bowl or large measuring cup, whisk together eggs, milk, melted butter, maple syrup (or honey or brown sugar), vanilla extract, lemon zest, lemon juice
Whisk until the eggs are fully broken up and the mixture looks smooth. It helps to have room temperature eggs and milk because if they’re super cold, they’ll solidify your melted butter and it will be harder to mix everything smoothly.
4. Combine wet and dry
Pour the wet mixture into the bowl with the oat mixture. Stir until all the oats are moistened and everything looks evenly mixed. The batter will be loose; that is what you want.
If you used chia seeds, let the batter sit for 10-ish minutes so the chia seeds absorb some moisture and get fluffy (no more, or the chia seeds will suck all the liquid out of your batter).
5. Fold in the blueberries
Gently fold in the blueberries.
If you use frozen blueberries, add them straight from the freezer. Try not to overmix so the color does not bleed too much into the batter.
6. Fill the muffin tin
Divide the mixture evenly into the 12 muffin cups.
The cups will be quite full; use a spoon or a small measuring cup to make sure you get both liquid and oats in each cup so they bake up evenly.
7. Bake the oatmeal cups
Bake for 20 to 25 minutes until the tops look set and lightly golden and the centers do not look wet.
If you gently touch the top of a cup, it should feel springy, not mushy.
Let the oatmeal cups cool in the pan for about 10 minutes. Run a thin knife around the edges if needed, then carefully lift them out to a wire rack. They will firm up more as they cool, so do not worry if they feel a little soft at first.
8. Add the lemon glaze (optional but lovely)
In a small bowl, stir together the powdered sugar and 1 tablespoon lemon juice. Add a bit more lemon juice, a few drops at a time, until you have a smooth drizzle.
Once the cups are mostly cool, spoon or drizzle the glaze over the tops. Let it set for a few minutes.
10. Store or serve
Enjoy warm right away or let them cool completely for meal prep.
Store in an airtight container in the fridge up to 5 days.
Reheat in the microwave for about 15 to 20 seconds per cup.
Pro Tips
- Use old-fashioned oats, not quick oats. I stick with old-fashioned oats, which hold their texture better and give these cups that chewy, muffin-like feel. Quick oats can make them a bit softer and more dense.
- Add chia seeds for extra hold. If you want oatmeal cups that really hold their shape for on-the-go breakfasts, I highly recommend the chia seeds. They soak up liquid and help bind everything together.
- Prevent sticking: Baked oatmeal likes to cling to the pan. I either spray generously and really get into each cup or use parchment liners. If anything does stick, running a thin knife around the edges works.
- Frozen blueberry tips: If your berries are very icy, toss them in a teaspoon of flour before folding them in so they do not sink to the bottom. Do not thaw; they will bleed less and hold their shape nicely.
- Freezer friendly: Once fully cooled, I freeze the cups on a baking sheet, then transfer them to a freezer bag. They keep for about 2 months. Reheat from frozen in the microwave for 30 to 40 seconds or until warm.
FAQs
Can I use steel-cut oats instead of old-fashioned oats?
I do not recommend it for this recipe. Steel-cut oats need more liquid and a longer cook time, so the texture will not turn out right in muffin form. Stick with old-fashioned oats here.
Can I make these dairy free?
Yes. Use any non-dairy milk you like, such as almond, oat, or soy milk, and choose coconut oil instead of butter. The rest of the ingredients are already dairy free.
Can I replace the eggs?
You can try using 2 flax eggs or chia eggs (1 tablespoon ground flax or chia + 3 tablespoons water per egg, let it sit until thickened). The texture may be a little softer, so I would definitely use the optional chia seeds for extra binding.
Can I use bottled lemon juice?
Fresh lemon juice and zest give the brightest flavor, especially for a recipe that highlights lemon. If you only have bottled juice, use it in the batter but still try to get fresh zest if possible.
Do these taste like oatmeal or muffins?
They sit somewhere in between. You get the hearty, chewy texture of baked oatmeal plus the look and convenience of muffins, with bright lemon blueberry flavor in every bite.
These Lemon Blueberry Baked Oatmeal Cups are such a happy little recipe; they make busy mornings feel calmer and more put together. I love that the batter stirs together in minutes, uses simple pantry ingredients, and works just as well for weekly meal prep as it does for a special brunch spread.
Whether you are planning a sweet Mother’s Day brunch, brainstorming easy Easter brunch ideas, or just need quick breakfast ideas that are pretty, portable, and satisfying, these oatmeal cups check every box. Make a batch once, and your future self will be so grateful every time you open the fridge and see them waiting.
Lemon Blueberry Baked Oatmeal Cups
Equipment
- 1 muffin tin
- 12 cupcake liners optiona, but recommended
Ingredients
Lemon Blueberry Baked Oatmeal Cups
- 2 1/2 cups old-fashioned oats
- 1 tsp baking powder
- 1 tsp cinnamon optional, but recommended
- 1/4 tsp salt
- 2 eggs room temperature
- 1 1/2 cups milk room tempreature
- 1/4 cup butter melted
- 1/3 cup maple syrup or honey or 1/2 cup brown sugar
- 1 tsp vanilla
- zest of 1 large lemon
- 2 Tbsp lemon juice fresh
- 1 1/2 cups blueberries fresh or frozen (don't thaw if using frozen)
- 2 Tbsp chia seeds optional, but recommended to help hold the baked oatmeal together
Lemon Glaze (Optional)
- 1 cup powdered sugar
- 1-2 Tbsp lemon juice fresh
Instructions
- Heat your oven to 350°F. Line a muffin tin with liners, or grease it really, really well so the oatmeal doesn’t stick.
- In a large mixing bowl, mix Old-fashioned oat, baking powder, cinnamon (if using), salt and chia seeds (if using). Stir until everything looks evenly combined.
- In a separate medium bowl or large measuring cup, whisk together eggs, milk, melted butter, maple syrup (or honey or brown sugar), vanilla extract, lemon zest, lemon juice.Whisk until the eggs are fully broken up and the mixture looks smooth. It helps to have room temperature eggs and milk because if they’re super cold, they’ll solidify your melted butter and it will be harder to mix everything smoothly.
- Pour the wet mixture into the bowl with the oat mixture. Stir until all the oats are moistened and everything looks evenly mixed. The batter will be loose; that is what you want.
- If you used chia seeds, let the batter sit for 10-ish minutes so the chia seeds absorb some moisture and get fluffy (no more, or the chia seeds will suck all the liquid out of your batter).
- Gently fold in the blueberries. If you use frozen blueberries, add them straight from the freezer. Try not to overmix so the color does not bleed too much into the batter.
- Divide the mixture evenly into the 12 muffin cups. The cups will be quite full; use a spoon or a small measuring cup to make sure you get both liquid and oats in each cup so they bake up evenly.
- Bake for 20 to 25 minutes until the tops look set and lightly golden and the centers do not look wet. If you gently touch the top of a cup, it should feel springy, not mushy.
- Let the oatmeal cups cool in the pan for about 10 minutes. Run a thin knife around the edges if needed, then carefully lift them out to a wire rack. They will firm up more as they cool, so do not worry if they feel a little soft at first.
- In a small bowl, stir together the powdered sugar and 1 tablespoon lemon juice. Add a bit more lemon juice, a few drops at a time, until you have a smooth drizzle.
- Once the cups are mostly cool, spoon or drizzle the glaze over the tops. Let it set for a few minutes.
- Store in an airtight container in the fridge up to 5 days. Reheat in the microwave for about 15 to 20 seconds per cup.
