This baked oatmeal makes a hearty, naturally gluten-free breakfast. It’s simple, flavorful, and satisfying—serve it plain or topped with fruit.
What is baked oatmeal?
Baked oatmeal is a breakfast casserole made mainly from oats, eggs, a sweetener, milk, and fat (oil or butter). Variations can be made without refined sugar, dairy, or eggs to suit dietary needs. Compared with stovetop oatmeal, baked oatmeal is denser and more bar-like—think soft, chewy, and lightly crisp on the edges.
What does baked oatmeal taste like?
This version has the comforting flavor of an oatmeal cookie in bar form: moist and chewy with a slightly crisp exterior and warm spices. The edge pieces are especially appealing.
Baked oatmeal vs. cooked oatmeal
- Baked oatmeal can range from a soft cookie texture to bread-pudding-like slices. Stovetop oatmeal is porridge-like—creamy and spoonable.
- Baked versions often include eggs (or substitutes), a fat like oil, and sometimes baking powder. Cooked oatmeal is typically just oats and liquid.
- Stovetop oatmeal is quicker but needs attention to avoid sticking or burning. Baked oatmeal is mostly hands-off: mix, pour, and bake.
Basic baked oats
This small-batch base recipe is quick and adaptable—only minutes to prepare and easy to customize with mix-ins and toppings.
Add-ins & variations
Baked oatmeal is delicious on its own, but you can change flavor and texture with a variety of additions and toppings:
- Fruit or yogurt: Top with apples, blueberries, strawberries, bananas, peaches, pears, or cherries for color and balanced nutrition.
- Maple syrup or honey: A simple drizzle to boost sweetness.
- Chocolate chips: Omit spices and stir in chips for a kid-friendly treat.
- Cinnamon apple: Fold in one or two finely chopped apples.
- Banana: Add sliced banana to the batter or as a topping.
- Mixed berries: Fresh or frozen berries work well mixed into the batter.
Baked oatmeal with quick oats
This recipe uses quick oats (not instant). Quick oats are smaller and thinner than rolled oats, so they absorb liquid faster and yield a tender bake.
Why is there baking powder in baked oatmeal?
Baking powder lightens the texture and gives the batter a bit of lift so the finished oatmeal isn’t overly dense.
Why use oil instead of butter?
Both fat types add moisture, but in this recipe oil produces a softer, more tender texture. Brown sugar contributes much of the flavor, so a neutral oil—vegetable oil or melted coconut oil—works well.
Can I use white sugar instead of brown?
Brown sugar plays an important role in both flavor and texture here, so substituting white sugar will change the result. If you try it, expect a different flavor and slightly different moisture level.
Glass pan or metal pan?
Either works. A glass pan may require a few extra minutes of baking time.
Can I use an 8×8-inch pan?
Yes. The bake will be slightly thicker and may need a bit more time in the oven.
How to tell when baked oatmeal is done
The top should be firm to the touch and the center fully set (not wet). Edges will be slightly darker and may pull away from the pan. A toothpick inserted in the center should come out mostly clean.
Can baked oatmeal be made the night before?
I don’t recommend baking it the night before because quick oats will absorb liquid and the texture can become overly soft. You can, however, mix the dry ingredients the night before and add the wet ingredients in the morning for fresh baking.
How long does baked oatmeal last? Can it be left out overnight?
You can leave baked oatmeal at room temperature overnight—about 24 hours is fine. After that, refrigerate to prevent spoilage. Properly stored in the fridge, it keeps for 4–5 days.
How do you store baked oatmeal?
Cover leftover pieces tightly with foil or plastic wrap, place in a resealable container, or keep them in the pan covered with foil in the refrigerator.
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Basic Baked Oatmeal Recipe
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Ingredients
Dry Ingredients
- 2 cups quick oats (not instant)
- 1/2 cup light or dark brown sugar, packed
- 1 teaspoon baking powder
- 1/2 teaspoon salt
- 2 teaspoons ground cinnamon
- 1/2 teaspoon ground nutmeg (optional)
Wet Ingredients
- 1 cup milk, dairy or nondairy
- 2 teaspoons vanilla extract
- 2 eggs
- 1/4 cup vegetable oil or melted coconut oil
Instructions
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Preheat the oven to 350°F (175°C).
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Prepare a 9×9-inch baking pan by spraying with nonstick spray, greasing with oil, or lining it with parchment paper.
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In a large bowl, combine all the dry ingredients until evenly mixed.
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Add the wet ingredients: stir in the milk and vanilla, then beat in the eggs and oil until combined.
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Pour the batter into the prepared pan and spread it into an even layer.
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Bake for 24–25 minutes, until the top is dry and firm to the touch.
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Cool in the pan for 15 minutes before slicing; slicing too soon can cause the bars to fall apart.
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Serve warm after cooling for the best texture and flavor.
Notes
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