Baked Oatmeal with Apples and Cinnamon (High Protein)

Baked oatmeal with apples and cinnamon (high protein) brings the comfort of a warm apple-cinnamon breakfast to an easy oven-baked format. Apples run through the oatmeal, while a second portion is scattered over the top with cinnamon, pecans, and optional brown sugar before baking.

The mixture combines applesauce, egg whites, plain Greek yogurt, milk, quick oats, and hemp hearts. Maple syrup and vanilla add sweetness and aroma, while cinnamon gives the oatmeal its familiar spiced character. The result is baked in a parchment-lined 9×13-inch dish and cut into nine pieces.

A short five-minute soak gives some of the milk time to absorb into the oats before the batter goes into the pan. After baking, the center should be set, the top golden, and a toothpick inserted in the middle should come out clean.

Serve the pieces warm or cold, with an optional drizzle of maple syrup and Greek yogurt whipped cream. Because the baked oatmeal keeps in the refrigerator or freezer, it fits the description of a cozy make-ahead breakfast without requiring a separate preparation day.

Ingredients

• ⅔ cup unsweetened apple sauce

• 1 cup egg whites

• 1 cup plain Greek yogurt

• 1 cup milk

• 2 Tbsp maple syrup

• 2 tsp vanilla extract

• 3 cups quick oats

• 1/2 cup hemp hearts

• 2 ½ tsp cinnamon, divided

• 1 tsp salt

• 2 tsp baking powder

• 1 tsp baking soda

• 3 cups apple, divided

• ½ cup pecans, roughly chopped

• 2 Tbsp brown sugar (optional), optional

• Optional topping: Greek yogurt whipped cream, optional

The ingredient list balances creamy, liquid, sweet, spiced, and crisp elements in one baked oatmeal mixture. Unsweetened applesauce joins the wet ingredients, while fresh apple is divided between the batter and the topping. That division gives the apple a presence throughout the oatmeal as well as on its surface.

Use the ingredients in these specified amounts:

Pecans are roughly chopped for the topping. Brown sugar is optional and belongs with the apple, cinnamon, and pecan topping. Greek yogurt whipped cream is also optional and is added after baking, along with a drizzle of maple syrup if desired.

How to Make Baked Oatmeal with Apples and Cinnamon (High Protein)

Begin by preheating the oven to 375°F (175°C). Line a 9×13-inch baking dish with parchment paper and set it aside. The parchment prepares the dish for the batter and keeps the baking setup straightforward.

In a large mixing bowl, combine the unsweetened apple sauce, egg whites, plain Greek yogurt, milk, maple syrup, vanilla extract, quick oats, hemp hearts, 2 teaspoons of the cinnamon, salt, baking powder, baking soda, and 2 cups of the apple. Stir with a large spoon or spatula until the ingredients are combined.

Let the mixture sit for about 5 minutes. This brief soaking step allows some of the milk to soak into the oats before baking. Once the mixture has rested, pour it into the prepared baking dish and spread it out evenly.

Add the remaining apple over the surface. Sprinkle with the remaining cinnamon, the roughly chopped pecans, and the optional brown sugar. Place the dish in the preheated oven and bake for 40–50 minutes.

Check the center for doneness rather than relying only on the outside appearance. The oatmeal is ready when the center is set, the top is golden, and a toothpick inserted into the middle comes out clean. Remove it from the oven and let it cool for 5–10 minutes before cutting it into 9 pieces.

For serving, add a drizzle of maple syrup and Greek yogurt whipped cream if desired. The complete preparation includes about 10 minutes of prep and about 40 minutes of cooking, with the baking time given as a 40–50 minute range.

Storage and Make-Ahead

Once the baked oatmeal has cooled completely, store it in an airtight container in the refrigerator for up to 5 days. Cooling completely is also the condition specified before freezing, so the baked oatmeal should not go into the freezer while it is still warm. For another make-ahead idea, see high-protein pumpkin baked oatmeal. For another make-ahead idea, see High Protein Vegan Avocado Toast.

For longer storage, freeze it for up to 3 months after it has cooled completely. When you are ready to eat it, reheat it in the microwave for 30–60 seconds, or enjoy it cold. The same serving options allow the pieces to work as a warm reheated breakfast or a chilled make-ahead portion.

The refrigerator and freezer instructions provide two storage windows: up to 5 days in the fridge or up to 3 months in the freezer. Keep the baked oatmeal in an airtight container for refrigerated storage, and make sure it is completely cool before freezing.

Why You’ll Love It

This baked oatmeal has the practical shape of a make-ahead breakfast: it is baked in one 9×13-inch dish and cut into 9 pieces. Instead of preparing individual portions, the finished oatmeal is divided after it has cooled for 5–10 minutes. You can also browse Pumpkin Baked Oatmeal for another option.

Its apple-cinnamon character comes from more than one layer. Applesauce is mixed into the batter, 2 cups of apple are stirred into the oats, and the remaining apple is placed on top. Cinnamon follows the same layered approach, with most of it in the batter and the rest on the surface. Another recipe you may want to try is Blender Cottage Cheese Pancakes Recipe (25g of Protein!) – Eat the Gains.

The topping also brings roughly chopped pecans and optional brown sugar, while maple syrup and Greek yogurt whipped cream can be added after baking. That combination makes the dish useful as a prepared breakfast that can be eaten warm, cold, refrigerated, or frozen according to the storage instructions.

Pro Tips for Success

A few details keep the preparation organized and help the oatmeal bake evenly: Another recipe you may want to try is Low Carb Greek Chicken Bowls.

• Line the 9×13-inch baking dish with parchment before mixing the batter. Set the prepared dish aside so it is ready as soon as the oat mixture has rested.

• Measure the cinnamon as a divided ingredient. Use 2 teaspoons in the batter and reserve the remaining amount for the top.

• Add only 2 cups of the apple to the bowl. The remaining apple belongs on the surface with the cinnamon, pecans, and optional brown sugar.

• Stir the batter until the ingredients are combined, then let it sit for about 5 minutes. This is the recipe’s soaking step and gives some of the milk time to soak into the oats.

• Spread the batter evenly in the prepared dish before adding the topping ingredients. An even layer makes the center easier to assess during the doneness check.

• Use the center as the main check near the end of baking. Look for a set center, a golden top, and a toothpick that comes out clean when inserted in the middle.

• Allow the baked oatmeal to cool for 5–10 minutes before cutting it into 9 pieces. If freezing, cool it completely first.

Flavor and Texture

The finished oatmeal is built around the familiar pairing of apple and cinnamon. Applesauce and apple are both part of the recipe, so the apple flavor is carried through the baked mixture and repeated in the topping. Cinnamon is present inside the oatmeal and across the top, keeping the spice profile consistent from the first bite to the surface. For more inspiration, see Easy Pumpkin Chocolate Chip Protein Muffins – Eat the Gains.

The top is finished with roughly chopped pecans and optional brown sugar. After baking, the center should be set rather than loose, the top should be golden, and the toothpick check should come out clean. Maple syrup and optional Greek yogurt whipped cream add a final topping when used.

The recipe can be eaten warm after its brief cooling period or cold after refrigeration. Its texture and serving temperature therefore work for either a freshly baked portion or a prepared piece taken from storage.

Serving Suggestions

After cooling for 5–10 minutes, cut the baked oatmeal into 9 pieces. Serve a piece with a drizzle of maple syrup and Greek yogurt whipped cream if desired. For another recipe idea, explore Protein Pumpkin Bread.

The pieces may be enjoyed warm or cold. For a warm serving after storage, reheat one in the microwave for 30–60 seconds. A refrigerated piece can also be enjoyed cold, which keeps the serving simple when the oatmeal has been prepared ahead.

The topping choices are flexible within the recipe’s stated options: the surface includes pecans and optional brown sugar before baking, while maple syrup and Greek yogurt whipped cream can be added afterward.

Troubleshooting

If the mixture seems too wet before it goes into the oven, do not skip the brief soaking step. Let it sit for about 5 minutes so some of the milk can soak into the quick oats, then pour it into the prepared dish and spread it evenly. You can also browse Pumpkin Protein Pancakes for another option.

If the baked oatmeal is not clearly done, check the center rather than judging only the top. Continue using the stated doneness cues: the center should be set, the top should be golden, and a toothpick inserted in the middle should come out clean.

If the apple or cinnamon topping seems uneven, remember that both ingredients are divided. Stir 2 cups of apple and 2 teaspoons of cinnamon into the batter, then reserve the remaining apple and cinnamon for the surface. Add the pecans and optional brown sugar there as well.

Frequently Asked Questions

What is the best way to prepare this baked oatmeal? Combine the applesauce, egg whites, Greek yogurt, milk, maple syrup, vanilla, oats, hemp hearts, 2 teaspoons of cinnamon, salt, baking powder, baking soda, and 2 cups of apple. Let the mixture sit for about 5 minutes, then spread it in the parchment-lined dish, add the remaining toppings, and bake.

How do I know when it is ready? The center should be set, the top should be golden, and a toothpick inserted in the middle should come out clean.

What temperature should I use? Bake at 375°F (175°C).

How long does it take? The prep time is about 10 minutes. Baking takes 40–50 minutes, for a total time of about 50 minutes.

What equipment do I need? You need a parchment-lined 9×13-inch baking dish, an oven, a large mixing bowl, a large spoon or spatula, and a toothpick for checking doneness.

How should I store it? Store it in an airtight container in the refrigerator for up to 5 days. Reheat it in the microwave for 30–60 seconds, or enjoy it cold.

Can I freeze it? Yes. Cool it completely before freezing, and freeze it for up to 3 months.

What should I know about the unsweetened applesauce? The recipe uses ⅔ cup of unsweetened apple sauce, which is combined with the wet ingredients and oats in the mixing bowl.