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This Slow Cooker blueberry oatmeal is an easy overnight breakfast with creamy rolled oats, sweet-tart berries, and warm cinnamon. Layer everything in the Slow Cooker before bed, and wake up to a cozy blue-purple bowl ready to serve. You’re going to love how simple it is.
Why You’ll Love It
- Overnight convenience — layer everything before bed and wake up to a warm breakfast.
- Simple ingredients — rolled oats, frozen blueberries, brown sugar, cinnamon, and water.
- Creamy and cozy — soft oats with sweet-tart pockets of blueberries throughout.
- Great for leftovers — it reheats beautifully with a splash of milk or water.
Ingredient Notes
Use old-fashioned rolled oats here, not quick oats. Quick oats have their place, but they will get too soft in the Slow Cooker over a long night. Rolled oats hold up and give you that comforting, substantial texture.
Frozen blueberries go straight in from the bag. No thawing, no rinsing, no fussing around. I usually buy whichever store brand is on sale, though the wild blueberries are lovely if you happen to have them. They’re smaller and tend to color the oatmeal even more dramatically.
Brown sugar gives this an old-school warmth that white sugar just doesn’t quite have. I use light brown sugar most of the time, because that’s what is in my pantry, but dark brown sugar works too and makes it a little more molasses-y. That may not be a word, but you know what I mean.
The pinch of salt is optional, though I use it. It doesn’t make the oatmeal salty; it just makes the sweet flavors taste less flat. Cinnamon is nonnegotiable in my opinion—except one time I forgot it, and it was still fine. So perhaps “strongly encouraged” is more accurate.
Ingredients
- 2 cups old-fashioned rolled oats
- 2 cups frozen blueberries, straight from the freezer—I don’t thaw them
- 4 cups water
- 1/3 cup packed brown sugar
- 1/2 teaspoon ground cinnamon
- Pinch of salt, optional, but I think it helps
Instructions
Lightly grease the inside of a 3- to 4-quart Slow Cooker with butter or cooking spray if you want easier cleanup. You do not have to do this, and I confess I skip it sometimes, then grumble while washing the crock the next morning. That is a me problem, not a recipe problem.
Pour the 2 cups of old-fashioned rolled oats into the bottom of the Slow Cooker and spread them into a reasonably even layer. Don’t worry about making it perfect; this is oatmeal, not a wedding cake.
Sprinkle the brown sugar, cinnamon, and pinch of salt, if you’re using it, over the dry oats. Leave everything layered for now instead of stirring. I know it feels odd, especially if you are the sort of person who wants to mix every bowl immediately. Resist the urge.
Dump the frozen blueberries evenly over the top. Keep the slow cooker unplugged and the lid off while you do this—mostly because it’s easier and safer, but also because I have a deep personal distrust of trying to assemble things around a hot appliance before coffee.
Slowly pour the 4 cups of water over and around the blueberries and oats, trying not to churn up the layers too much. The water will settle down through everything on its own. It always looks like there is too much water at first, then by morning it is all absorbed and nobody remembers being worried.
Cover the slow cooker, set it to LOW, and cook for 6 to 8 hours, or overnight, until the oats are tender and the blueberries have burst. The oatmeal should be a rich bluish-purple color by then. If you cook it closer to 8 hours, it will be thicker and softer, which I like.
Stir the oatmeal well before serving so the berries, oats, and sweetened cinnamon liquid all come together. If it seems thicker than you prefer, stir in a splash of hot water or milk until it loosens up. I nearly always add a little milk, despite claiming I like it thick. There you have it.
Taste and add a touch more brown sugar or a drizzle of maple syrup if your blueberries were especially tart. Serve hot with more cinnamon, cold milk or cream, and a little pat of butter if you want the full comforting, old-timey bowlful.
Variations
Stir in a teaspoon of vanilla at the end for a bakery smell—like blueberry muffins without the part where you have flour on your shirt and somehow in your hair. Chopped walnuts or pecans give you a nice little crunch against the soft oats.
For a richer version, replace 1 or 2 cups of the water with milk or half-and-half. Just know that dairy can brown a bit around the edges of the slow cooker. It isn’t bad, not at all, but it does make the cleanup more annoying. Making the whole recipe with milk works, technically, but the edges can look like they have been through a minor war. Stick with mostly water unless you’re feeling brave or unusually patient.
If you want less sweetness, use 1/4 cup brown sugar or leave it out and sweeten each bowl to taste. That sounds civilized.
You can also replace 1/2 cup of the rolled oats with steel-cut oats for a heartier texture, keeping the same amount of liquid. Let it cook toward the longer end of that 6- to 8-hour range if you do. I wouldn’t swap all the oats for steel-cut ones here, though. Different recipe, different morning.
Storage & Reheating
Leftover blueberry oatmeal keeps in the refrigerator for up to 4 days. I scoop it into a container, let it cool a little first, then tuck it behind the yogurt where nobody mistakes it for something else. It will thicken quite a bit in the fridge—don’t panic. Oatmeal does that. It’s clingy.
To reheat, put a serving in a microwave-safe bowl with a splash of milk or water and heat until hot, stirring once or twice. Add more liquid if it needs it. I don’t measure the splash; I just pour a little in and see what happens, which is how I approach most leftovers and, frankly, several major life decisions.
You can reheat it on the stovetop too, over low heat with milk or water stirred in. That’s nice when you’re making a couple servings at once, although the microwave is usually what happens around here. The stove is for when I’m pretending nobody needs to be anywhere.
Final Notes
There is something about waking up to a slow cooker breakfast that still feels almost miraculous to me. You put a few humble things in a crock the night before, go to bed with your worries and your laundry and whatever nonsense was on the evening news, and then the house smells warm by morning.
Not fancy. Not dramatic. Just blueberries and oats doing what they do.
Add cold milk if you can. It makes the warm berries taste even better.
Slow Cooker Amish Blueberry Oatmeal
Ingredients
- 2 cups old-fashioned rolled oats
- 2 cups frozen blueberries Use straight from the freezer; do not thaw.
- 4 cups water
- 1/3 cup packed brown sugar
- 1/2 teaspoon ground cinnamon
- 1 pinch salt Optional.
Instructions
- Lightly grease the inside of a 3- to 4-quart slow cooker with butter or cooking spray for easier cleanup, if desired.
- Pour the rolled oats into the bottom of the slow cooker and spread them into an even layer.
- Sprinkle the brown sugar, cinnamon, and optional salt over the dry oats without stirring.
- Spread the frozen blueberries evenly over the seasoned oats.
- Slowly pour the water over and around the blueberries and oats, trying not to disturb the layers too much.
- Cover the slow cooker, set it to LOW, and cook for 6 to 8 hours, or overnight, until the oats are tender and the blueberries have burst.
- Stir the oatmeal well before serving so the berries, oats, and sweetened cinnamon liquid combine.
- If the oatmeal is too thick, stir in a splash of hot water or milk, then taste and add more brown sugar or maple syrup if needed; serve hot with more cinnamon, cold milk or cream, or a pat of butter.