Half-Baked Apple Cinnamon Oatmeal Squares

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

Warm baked oatmeal squares infused with apples and cinnamon, using half the sugar for a wholesome breakfast or snack. This american-inspired breakfast ready in about 50 minutes combines rolled oats, baking powder, ground cinnamon into a breakfast that fuels the morning without the midday crash — make-ahead-friendly and balanced enough to anchor the first meal of the day. Each serving lands at about 220 calories and feeds 6, so it sits comfortably in a weekly breakfast rotation alongside fruit, yogurt, or coffee. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 10 min Cook: 40 min Serves 6 American cuisine 220 cal/serving
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Ingredients

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Instructions

  1. Step 1: Preheat oven to 350°F. In a large bowl, mix 2 cups rolled oats, 1 tsp baking powder, 2 tsp ground cinnamon, and 1/2 tsp salt.
  2. Step 2: In a separate bowl, whisk 2 large eggs, 1 cup milk, 1/2 cup half-and-half, 1/4 cup maple syrup, and 1 tsp vanilla extract until combined.
  3. Step 3: Pour the wet ingredients into the dry oat mixture and stir gently to combine. Fold in 1 large diced apple and 1/2 cup chopped walnuts.
  4. Step 4: Grease an 8x8-inch baking dish with butter or oil. Pour the oatmeal mixture evenly into the dish and smooth the top.
  5. Step 5: Bake for 35-40 minutes until the edges are golden and a toothpick inserted in the center comes out clean. Let cool for 10 minutes before slicing into squares and serving warm.

Frequently asked questions

How long does Half-Baked Apple Cinnamon Oatmeal Squares take to make?

Total time is about 50 minutes (10 min prep + 40 min cook). Most home cooks find this fits comfortably into a busy morning; prep components the night before to save active time.

How do I store leftover Half-Baked Apple Cinnamon Oatmeal Squares?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat in the microwave or oven; egg- or grain-based items may need a splash of milk or water to refresh texture. Cold-served items (overnight oats, smoothies) keep 2–3 days in the fridge.

Can I substitute ingredients in Half-Baked Apple Cinnamon Oatmeal Squares?

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 Half-Baked Apple Cinnamon Oatmeal Squares 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 Half-Baked Apple Cinnamon Oatmeal Squares?

American breakfast 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.