The short answer: this baked oatmeal recipe stirs 2 cups of old-fashioned oats with milk, 2 eggs, maple syrup, cinnamon and berries in one bowl, then bakes in an 8x8 pan at 375°F for 35–40 minutes. It makes 6 squares you can reheat all week.
- Key numbers: 10 minutes prep · 35–40 minutes bake · 6 servings · fridge 3–4 days · freezer 3–4 months
- Top moves: use old-fashioned oats, bake until the center is set, rest 10 minutes before slicing, and switch the fruit for a new flavor each week
- Save it: get the free recipe book starter pages (we email it to you), or plan a week of breakfasts in the Meal Planner & Grocery List ($3.99)
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Prep time: 10 minCook time: 40 minTotal time: 1 hrServings: 6 servingsTotal includes 10 min of resting, chilling or rising.
Food safety temperatures and storage times were checked November 13, 2026, against FoodSafety.gov and USDA FSIS. The sections below cover the ingredients, steps, 8 flavors, swaps, make-ahead plans and troubleshooting.
Baked oatmeal ingredients (8x8 pan, 6 servings)
| Ingredient | Amount | Notes |
|---|---|---|
| Old-fashioned rolled oats | 2 cups | Not quick or steel-cut |
| Baking powder | 1 teaspoon | Makes it lighter |
| Ground cinnamon | 1 1/2 teaspoons | |
| Salt | 1/2 teaspoon | |
| Milk | 1 3/4 cups | Any dairy or unsweetened plant milk |
| Eggs | 2 large | See egg-free swaps below |
| Maple syrup or brown sugar | 1/3 cup | Use 1/4 cup for less sweet |
| Butter, melted | 3 tablespoons | Or coconut oil |
| Vanilla extract | 1 teaspoon | |
| Blueberries | 1 cup | Fresh or frozen (don't thaw) |
| Chopped walnuts or pecans (optional) | 1/3 cup |
Baked oatmeal directions
- Heat and grease. Heat the oven to 375°F and grease an 8x8-inch baking dish.
- Mix the dry ingredients. In a large bowl, stir together the oats, baking powder, cinnamon and salt.
- Mix the wet ingredients. In another bowl, whisk the milk, eggs, maple syrup, melted butter and vanilla.
- Combine. Pour the wet mix over the oats, stir, then fold in most of the berries. Spread it in the pan and scatter the rest of the berries and the nuts on top.
- Bake. Bake 35–40 minutes, until the center is set and no longer jiggles and the edges are golden. Since it contains eggs, the center should reach 160°F, the safe temperature for egg dishes per FoodSafety.gov.
- Rest and slice. Let it rest 10 minutes so it firms up, then cut into 6 squares. Serve warm with a splash of milk, a spoon of Greek yogurt or a drizzle of maple syrup.
Double batch: use a 9x13 pan and double everything. Bake about 40–45 minutes.
8 baked oatmeal flavors
Use the base recipe and swap the blueberries and nuts for these add-ins.
| Flavor | Swap in | Extra tip |
|---|---|---|
| Blueberry (classic) | 1 cup blueberries, lemon zest | Frozen berries go in straight from the freezer |
| Apple cinnamon | 1 1/2 cups diced apple, 1/3 cup walnuts | Add 1/4 tsp nutmeg |
| Banana nut | 2 mashed ripe bananas (cut maple to 3 tbsp), 1/3 cup pecans | Top with banana slices |
| Peanut butter chocolate chip | 1/3 cup peanut butter whisked into the wet mix, 1/3 cup chocolate chips | Cut butter to 1 tbsp |
| Pumpkin spice | 3/4 cup canned pumpkin, 1 tsp pumpkin pie spice | Add 5 minutes to the bake |
| Strawberry | 1 1/2 cups chopped strawberries | Pat fruit dry to avoid soggy spots |
| Cranberry orange | 3/4 cup fresh cranberries, 1 tbsp orange zest | A good holiday brunch pan |
| Carrot cake | 1 cup grated carrot, 1/3 cup raisins, 1/2 tsp ginger | Top with a little cream cheese or yogurt |
Baked oatmeal swaps (dairy-free, egg-free, less sugar)
| Need | Swap | Result |
|---|---|---|
| Dairy-free | Almond, oat or soy milk; coconut oil for butter | Same bake time |
| Egg-free | 1/2 cup mashed banana or applesauce, or 2 flax eggs | Softer; cool 15 minutes before slicing |
| Less sugar | 2–3 tbsp maple syrup plus a ripe banana | Sweetness comes from fruit |
| More protein | 1/2 cup Greek yogurt in the wet mix, or serve with yogurt | Slightly denser |
| Gluten-free | Oats labeled gluten-free | Regular oats can be cross-contaminated |
Make-ahead baked oatmeal plan
- Night-before: mix, pour into the pan, cover and refrigerate. Bake in the morning and add about 5 minutes.
- Weekly prep: bake on Sunday, cool, cut into 6 squares and refrigerate in a covered container. Microwave a square 30–45 seconds.
- Freezer: wrap cooled squares individually and freeze. Reheat from frozen for 60–90 seconds.
| Storage | How long | Source |
|---|---|---|
| Counter after baking | Up to 2 hours | USDA FSIS |
| Refrigerator | 3–4 days | USDA FSIS |
| Freezer | 3–4 months for best quality | USDA FSIS |
| Reheat | Until steaming hot (165°F) | USDA FSIS |
Baked oatmeal troubleshooting
| Problem | Likely cause | Fix |
|---|---|---|
| Soggy or wet center | Underbaked, quick oats, juicy fruit | Bake until set, use rolled oats, pat fruit dry |
| Dry and crumbly | Overbaked or not enough milk | Pull it when the center just sets; add 1/4 cup milk next time |
| Bland | Too little salt or spice | Use the full 1/2 tsp salt and fresh cinnamon |
| Fruit sank | Fruit stirred in too early | Scatter half the fruit on top before baking |
| Sticks to the pan | Pan not greased | Grease well or line with parchment |
More oat and make-ahead breakfast ideas
Prefer stovetop or no-cook? See our oatmeal recipe and overnight oats, and read is oatmeal good for you for the nutrition side. For more morning ideas, browse healthy breakfast ideas, quick breakfast ideas and high protein breakfast picks.
Plan breakfasts on a budget
Oats, eggs, milk and frozen fruit are budget-friendly staples, and one pan covers 6 mornings. Plan the week with meal planning on a budget, track oat and fruit prices in a grocery price book, and keep food spending on track with the Budget Planner Printable ($5.99).
Write each week's flavor in the Meal Planner & Grocery List ($3.99), and save your base recipe and family favorites in the Family Recipe Binder ($6.99). Browse all Home & organizing printables.
Frequently asked questions
What is baked oatmeal? Baked oatmeal is old-fashioned oats mixed with milk, eggs, a little sweetener and fruit, then baked in a pan until it sets like a soft, sliceable oatmeal cake. It's a make-ahead breakfast: one 8x8 pan gives you 6 servings to reheat all week.
What oats are best for baked oatmeal? Old-fashioned rolled oats are best for baked oatmeal because they soften but keep some chew. Quick oats turn mushy, and steel-cut oats stay too firm unless you soak them overnight and add extra baking time.
How long do you bake baked oatmeal? Bake it at 375°F for 35 to 40 minutes in an 8x8 pan, until the center is set and the edges are golden. A 9x13 pan with a double batch takes about 40 to 45 minutes. Because it contains eggs, it should reach 160°F in the center.
Can you make baked oatmeal the night before? Yes. Mix everything, pour it into the greased pan, cover and refrigerate overnight, then bake in the morning, adding about 5 minutes to the bake time. You can also bake it ahead and reheat slices all week.
Can you freeze baked oatmeal? Yes. Cool it completely, cut it into squares, wrap each one, and freeze for up to 3 to 4 months, in line with USDA leftover guidance. Reheat a frozen square in the microwave for about 60 to 90 seconds until hot.
How long does baked oatmeal last in the fridge? Baked oatmeal keeps 3 to 4 days in the refrigerator in a covered container, per USDA guidance on leftovers. Refrigerate it within 2 hours of baking.
How do I make baked oatmeal without eggs? Replace the 2 eggs with 1/2 cup mashed ripe banana or unsweetened applesauce, or 2 flax eggs (2 tablespoons ground flaxseed plus 5 tablespoons water, rested 5 minutes). Egg-free baked oatmeal is softer, so let it cool 15 minutes before slicing.
Is baked oatmeal healthy? Baked oatmeal can be a healthy breakfast because it's built on whole-grain oats, milk, eggs and fruit. Keep it that way by measuring the sweetener, leaning on fruit for sweetness, and adding nuts or Greek yogurt for protein.
Why is my baked oatmeal soggy? Baked oatmeal turns out soggy when it's underbaked, made with quick oats, or packed with very juicy fruit. Bake until the center no longer jiggles, use old-fashioned oats, and let it rest 10 minutes so the liquid finishes soaking in.
How do I plan baked oatmeal into a weekly breakfast routine? Bake one pan on Sunday and write a flavor for each week in the Meal Planner & Grocery List ($3.99) from HomeBase Paper Co. Adding oats, milk, eggs and fruit to the grocery list keeps breakfast covered for 6 mornings.
Where can I keep my family's baked oatmeal recipe and flavor ideas? The Family Recipe Binder ($6.99) from HomeBase Paper Co. holds your base baked oatmeal recipe plus the flavors your family likes best. You can also start with the free recipe book starter pages, which we email to you.
Sources
- FoodSafety.gov: Safe minimum internal temperatures foodsafety.gov
- USDA FSIS: Leftovers and Food Safety fsis.usda.gov