Baked Cinnamon-Spiced Apple Oatmeal with Walnuts

By AislePrompt Test Kitchen · Reviewed by AislePrompt Editorial · ·

A warm, comforting baked oatmeal infused with cinnamon and nutmeg, studded with tender apples and crunchy walnuts. This american-inspired father’s day ready in about 55 minutes pairs old-fashioned rolled oats, baking powder, ground cinnamon for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 280 calories and feeds 6, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart.

★ 4.6 (15 ratings) Prep: 10 min Cook: 45 min Serves 6 American cuisine 280 cal/serving
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Ingredients

Instructions

  1. Step 1: Preheat oven to 350°F. In a large bowl, combine 2 cups old-fashioned rolled oats, 1 tsp baking powder, 2 tsp ground cinnamon, 1/2 tsp ground nutmeg, and 1/4 tsp salt.
  2. Step 2: In a separate bowl, whisk together 2 1/2 cups unsweetened almond milk, 2 large eggs, 1/3 cup maple syrup, and 1 tsp vanilla extract until smooth.
  3. Step 3: Pour the wet mixture into the oat mixture and stir to combine thoroughly. Fold in 1 large peeled and diced apple and 1/2 cup chopped walnuts.
  4. Step 4: Transfer the mixture to a greased 8-inch square baking dish and spread evenly.
  5. Step 5: Bake for 40-45 minutes until the oatmeal is set, golden on top, and a toothpick inserted in the center comes out clean.
  6. Step 6: Let cool slightly before serving warm, optionally drizzled with extra maple syrup or a dollop of yogurt.

Frequently asked questions

How long does Baked Cinnamon-Spiced Apple Oatmeal with Walnuts take to make?

Total time is about 55 minutes (10 min prep + 45 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Baked Cinnamon-Spiced Apple Oatmeal with Walnuts?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep old-fashioned rolled oats from drying out.

Can I substitute ingredients in Baked Cinnamon-Spiced Apple Oatmeal with Walnuts?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Baked Cinnamon-Spiced Apple Oatmeal with Walnuts for a different number of people?

The recipe is written for 6 servings. Multiply each ingredient by (your serving target / 6). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

What goes well with Baked Cinnamon-Spiced Apple Oatmeal with Walnuts?

American father’s day like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.

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