Overnight Blueberry Baked Oatmeal

There is a specific kind of morning chaos that only a mom understands. Everyone wakes up starving at the same minute, nobody can find a shoe, and somehow I am supposed to produce a hot breakfast while also locating a permission slip. This baked oatmeal is my quiet little cheat code for those mornings. I throw it together the night before, slide it in the fridge, and in the morning it goes straight into the oven while I deal with the shoe situation.

It comes out warm and just sweet enough, with pockets of jammy blueberries in every bite. It feels like a treat but it is really just oats, so I never feel weird about a second helping.

Why I keep coming back to this one

Make-ahead breakfasts live or die by how good they are reheated, and this one actually gets better. The oats soak up the custard overnight so the texture turns soft and almost bread-pudding-like. It also stretches. One pan feeds my crew for two mornings, which during a busy week feels like a small miracle.

A few honest tips

Use old-fashioned rolled oats, not quick oats, or you will end up with mush. Frozen blueberries work great and you do not even need to thaw them. And do not skip the overnight chill if you can help it, that resting time is what makes the inside so plush. If you are short on time though, you can bake it right away and it is still lovely, just a touch more loose.

Heads up, a couple of the links below are affiliate links, which just means I earn a tiny commission at no cost to you if you grab something. I only link the stuff I actually use.

I make this in a basic 8×8 ceramic baking dish, and I buy old-fashioned rolled oats in the big bag because we go through them fast.

Overnight Blueberry Baked Oatmeal

A cozy make-ahead breakfast you assemble at night and bake in the morning. Warm, lightly sweet, and packed with juicy blueberries.

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Prep Time 10 minutes mins

Cook Time 40 minutes mins

Chill (overnight, optional) 8 hours hrs

Total Time 50 minutes mins

Servings: 6 servings

Course: Breakfast

Cuisine: American

Ingredients Method Notes

Ingredients

  

• 2 cups old-fashioned rolled oats
• 1/3 cup brown sugar packed
• 1 tsp baking powder
• 1 tsp ground cinnamon
• 1/2 tsp salt
• 2 cups milk
• 1 large egg
• 1/4 cup butter melted
• 2 tsp vanilla extract
• 1 1/2 cups blueberries fresh or frozen

Method

 

1. In a large bowl, stir together the oats, brown sugar, baking powder, cinnamon, and salt.
2. In a separate bowl, whisk the milk, egg, melted butter, and vanilla until smooth.
3. Grease an 8×8 baking dish. Scatter half the blueberries across the bottom, spread the oat mixture on top, then pour the milk mixture over everything. Finish with the remaining blueberries.
4. For make-ahead, cover and refrigerate overnight. You can also bake it right away.
5. Bake at 375F for 35 to 40 minutes, until the top is golden and the center is set. Let cool 5 minutes and serve warm.

Notes

Use frozen blueberries straight from the freezer, no need to thaw. Swap in raspberries or diced peaches if that is what you have. Leftovers keep in the fridge for 4 days and reheat beautifully.

The takeaway

If your mornings feel like a sprint, do yourself the favor and prep this the night before. Future you, standing in the kitchen with a hot pan and a calm-ish house, will be so grateful. If you try it, come tell me how it went, I love hearing what berries you used.

So glad you are here.
xo, Pam