This crockpot banana oatmeal starts with whole peeled bananas, so you can skip slicing or mashing them before cooking. Steel-cut oats, brown sugar and warm spices cook alongside the bananas overnight. In the morning, mash everything together for a bowl of banana bread oatmeal with breakfast already mostly handled.

After making my overnight apple oatmeal with whole apples, of course I had to try bananas next! My thinking was the same: if I’m going to mash the fruit into the oatmeal anyway, why do that work before cooking? I left the bananas whole, sprinkled the brown sugar and spices over them and let the crockpot take over. Seven hours on low gave me creamy oatmeal and bananas I could mash right into the pot with a potato masher.

Expect soft, spoonable oatmeal with banana throughout, rather than a sliceable baked oatmeal. I cook it with water and add milk or cream at the end so I can adjust the consistency after the bananas are mashed in.

Creamy banana oatmeal topped with crushed graham crackers in a bowl.

Why This Recipe Works

The bananas go in whole. Peel them and lay them over the oats. Save the mashing for the morning, when they’re soft enough to break apart easily.
Breakfast cooks overnight. Seven hours on low worked perfectly in my test, with just mashing, stirring and toppings left to do.
You get banana bread flavors in an oatmeal bowl. Ripe bananas, brown sugar, cinnamon, nutmeg and vanilla bring that familiar combination to breakfast.
You control the final texture. Mash thoroughly for banana throughout or leave a few soft pieces, then add milk or cream to loosen the oatmeal.

Ingredient Notes

Steel-cut oats: Use regular steel-cut oats for the version I tested. Rolled oats, quick oats and quick-cooking steel-cut oats are not direct substitutes for this timing and liquid ratio.

Bananas: Use 3 to 4 ripe bananas, peeled and left whole. Ripe bananas provide more sweetness than underripe ones. They will soften and get mashed into the oatmeal, so they don’t need to hold their shape.

Water: Four cups of water provide the cooking liquid for one cup of steel-cut oats. Milk or cream goes in after cooking.

Brown sugar: Start with 1/4 cup packed brown sugar. You can add a little more near the end of cooking or adjust the sweetness when serving.

Cinnamon and nutmeg: These give the oatmeal its warm banana bread flavor. The small amount of nutmeg complements the cinnamon without taking over.

Salted butter and salt: Butter adds richness, while salt balances the sweetness.

Vanilla extract: Stir this in after cooking.

Milk or cream: Add a little at a time after mashing the bananas until the oatmeal reaches the consistency you like.

Equipment You’ll Need

Crockpot or slow cooker: For cooking the oats and whole bananas overnight on low.
Potato masher: I use this to mash the softened bananas directly into the oatmeal after cooking. No transferring to another bowl! A fork or sturdy spoon also works.

How to Make Crockpot Banana Oatmeal

Oats and bananas cooking in a slow cooker with water pouring in.

Prepare the crockpot. Coat the inside with nonstick cooking spray. Add the steel-cut oats and water, then stir briefly to combine.

Sliced bananas in a creamy mixture in a slow cooker for oatmeal.

Add the whole bananas. Peel the bananas and lay them over the oatmeal mixture. There’s no need to slice or mash them first.

Four butter cubes melting in a slow cooker with liquid and cinnamon.

Add the sugar, spices and butter. Combine the brown sugar, cinnamon, nutmeg and salt in a small bowl. Sprinkle evenly over the bananas, then distribute the butter pieces over the top.

Bacon strips in a skillet with crispy edges and rendered fat.

Cook overnight. Cover and cook on low for approximately 7 hours, until the oats are tender and the bananas mash easily. If desired, sprinkle a little extra brown sugar over the bananas during the final 10 to 15 minutes and replace the lid.

Bacon being cooked in a slow cooker with a meat fork.

Mash and stir. Use a potato masher to mash the bananas directly into the oatmeal. A fork or sturdy spoon also works. Stir in the vanilla, then add milk or cream as needed.

Creamy oatmeal topped with granola and chocolate chips in a white bowl.

Finish your bowls. Spoon into bowls and add granola, chopped nuts, maple syrup or fresh banana slices.

Recipe Tips

Seven hours is the timing I tested. Slow cookers vary, so check for tender oats and watch for dry edges the first time you make it. If yours tends to run hot, make the first batch during the day so you can check it.
Use low heat. This method is built around a long, gentle cook. I haven’t tested a shorter cook on high.
Mash before adding more liquid. Incorporate the bananas and stir everything together before deciding how much milk or cream you need.
The extra brown sugar is optional. You don’t need to interrupt your morning to add it before cooking finishes. Taste and adjust the sweetness when serving instead.
Expect the oatmeal to thicken as it sits. Add a splash of milk, cream or water to loosen it.

Toppings and Serving Ideas

Banana bread bowls: Add chopped pecans or walnuts and a splash of cream.
A crunchy finish: Sprinkle granola or prepared cinnamon streusel over individual servings.
Fresh banana topping: Add sliced bananas just before serving.
Extra sweetness: Finish with a drizzle of maple syrup or a sprinkle of brown sugar.
Peanut butter banana oatmeal: Stir a spoonful of peanut butter into your bowl after cooking.

How to Store and Reheat

Refrigerator: Divide leftovers into shallow containers and refrigerate within two hours. Store covered for 3 to 4 days.

Freezer: Freeze in individual portions in freezer-safe containers for up to 3 months for best quality.

Reheating: Thaw frozen portions overnight in the refrigerator. Reheat in the microwave or a saucepan, stirring occasionally and adding a splash of water or milk to loosen the oatmeal. Heat leftovers to 165°F.

Close-up of cooked banana oatmeal in a purple spoon with a textured surface.

Frequently Asked Questions

Do I need to mash the bananas before cooking?

No! This version starts with whole peeled bananas. They soften during cooking, then you mash them directly into the oatmeal before serving.

Can I use rolled oats instead of steel-cut oats?

Stick with regular steel-cut oats for this recipe. I tested the seven-hour cooking time and four cups of water with steel-cut oats. Rolled oats would need a different cooking time and potentially a different amount of liquid.

Can I cook banana oatmeal longer than seven hours?

Seven hours produced perfectly creamy oatmeal in my test. It may tolerate a little longer, but that depends on your slow cooker. Check the edges for dryness rather than assuming it can cook all night regardless of how long you sleep.

Can I use milk instead of water?

The version I tested uses water during cooking, with milk or cream added afterward. That’s the method I recommend for this recipe.

Why did my banana oatmeal get so thick?

Oatmeal thickens as it sits and cools. Mash the bananas, stir well and add milk, cream or water a little at a time to loosen it.

More Breakfast Recipes to Try

Overnight Apple Oatmeal: Love the whole-banana shortcut? Try my whole-apple version next.
Instant Pot Apple Oatmeal: For mornings when you didn’t start the crockpot the night before.
Banana Crumb Muffins: Have more ripe bananas to use? These muffins have a brown sugar crumb topping.

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Megan Porta is a comfort food recipe creator who specializes in easy family meals and Instant Pot desserts, and the founder of Pip and Ebby. She has been cooking for three decades and developing recipes for over fifteen years, helping home cooks make reliable, cozy recipes for real life.

Crockpot Banana Oatmeal With Whole Bananas