High-Protein Apple Cinnamon French Toast Bake (Gluten-Free)

Cool October mornings call for warm, cozy breakfasts, but getting enough protein early in the day can be a challenge. This High-Protein Apple Cinnamon French Toast Bake combines sweet tender apples, cozy fall spices, and dense gluten-free bread soaked in an ultra-creamy, protein-rich custard. Instead of relying solely on eggs, a quick blend of egg whites, warm spices, and protein powder creates a rich bake that packs over 30 grams of protein per slice—without feeling heavy or rubbery.

Whether you are prepping breakfast for the week or serving a fall weekend brunch, this recipe delivers all the classic flavors of apple pie and traditional French toast in one easy, make-ahead dish. If you enjoy cozy morning meals, you might also love our Loaded Gluten-Free Breakfast Potato Skillet for a savory breakfast option.

Why This Recipe Works

• Stale Bread Advantage: Using slightly dried or stale gluten-free bread allows it to absorb maximum liquid without turning to mush.
• Blended Custard Base: Whisking the vanilla protein powder thoroughly with Greek yogurt and egg whites prevents powder clumps and yields a smooth, bakery-style texture.
• Layered Flavor Profile: Tossing half the cinnamon apples into the bread cubes and layering the rest on top ensures every single bite has sweet, spiced fruit.

Ingredients You'll Need

• Gluten-Free Bread (8 cups cubed): A sturdy gluten-free white or brioche-style loaf works best. Cut into 1-inch cubes and left to dry out slightly.
• Honeycrisp or Gala Apples (2 medium): Cored and diced small. These varieties hold their structure well during baking.
• Liquid Egg Whites (1.5 cups): Provides pure, lean protein while keeping the custard light and fluffy.
• Whole Eggs (2 large): Adds natural fats and richness essential for a traditional French toast mouthfeel.
• Plain Nonfat Greek Yogurt (1/2 cup): Enhances creaminess and boosts the protein content without added fat.
• Unsweetened Almond Milk (1 cup): thins out the custard mix to ensure complete absorption into the bread.
• Vanilla Whey or Whey/Casein Blend Protein Powder (2 scoops / approx. 60g): Adds natural sweetness and high-quality protein.
• Ground Cinnamon (2 tsp) & Ground Nutmeg (1/4 tsp): The classic fall spice combination.
• Pure Vanilla Extract (1 tsp) & Maple Syrup (2 tbsp): Adds depth, aroma, and natural sweetness to the apple mixture.

Step-by-Step Instructions

1. Prep Equipment & Bread: Preheat your oven to 350°F (175°C). Grease an 8x11-inch or 9x13-inch baking dish with non-stick cooking spray. Spread your cubed gluten-free bread on a baking sheet and bake for 6–8 minutes to dry out slightly. Let cool for 5 minutes.
2. Sauté the Apples: Place a skillet over medium heat. Add the diced apples, 1 tablespoon of maple syrup, 1 teaspoon of ground cinnamon, and 2 tablespoons of water. Cook for 5–6 minutes until slightly softened but still holding shape. Remove from heat.
3. Blend the Protein Custard: In a large mixing bowl or blender, combine the egg whites, whole eggs, Greek yogurt, almond milk, vanilla protein powder, remaining cinnamon (1 tsp), nutmeg, vanilla extract, and remaining maple syrup (1 tbsp). Whisk vigorously or blend until completely smooth.
4. Assemble the Casserole: Place half of the dried bread cubes into the prepared baking dish. Top with half of the cooked cinnamon apples. Add the remaining bread cubes and top with the rest of the apples.
5. Soak and Rest: Pour the protein custard evenly over the entire dish, ensuring all bread cubes are coated. Gently press down on the bread cubes with a spatula to absorb the liquid. Let sit at room temperature for 10–15 minutes (or cover and refrigerate overnight).
6. Bake to Perfection: Bake uncovered at 350°F (175°C) for 35–40 minutes, until the center is set and the top turns golden brown and slightly crisp. Allow to cool for 10 minutes before slicing into 4 equal portions.

Chef's Cooking Tips & Troubleshooting

Preventing Soggy Gluten-Free Bread: Gluten-free bread is denser and absorbs liquids differently than standard wheat bread. Staling or light-toasting your bread in the oven beforehand creates a protective crust that prevents it from dissolving into porridge when soaked.

Choosing the Right Protein Powder: A whey-casein blend or a well-dissolving whey isolate works best. Plant-based powders require about 1/4 cup extra liquid as they tend to absorb more moisture.

Meal Prep, Storage & Reheating

This recipe is exceptionally packable for weekly meal prep or quick morning work routines:

• Refrigerator Storage: Slice into individual portions and store in airtight containers in the fridge for up to 4 days.
• Microwave Reheating: Heat an individual slice on high for 60 to 90 seconds until warm throughout.
• Oven/Air Fryer Reheating: For crisp edges, pop a slice into the air fryer at 325°F for 3–4 minutes or warm in the toaster oven.

Looking for more high-protein morning meal prep options? Check out our delicious Salty-Sweet Cottage Cheese Breakfast Bowls.

Frequently Asked Questions

Can I make this Apple Cinnamon French Toast Bake overnight?

Yes! Assemble the dish completely, cover tightly with foil, and store in the refrigerator overnight. In the morning, bake directly from the fridge, adding 5–8 minutes to the total baking time.

What if I don't want to use protein powder?

You can omit the protein powder and replace it with an additional 1/2 cup of Greek yogurt, 1 extra whole egg, and 1 tablespoon of pure maple syrup or sweetener of choice.

Does this bake freeze well?

It freezes decently, though the texture of the apples is softest when fresh. Freeze individual baked slices wrapped tightly in parchment paper and foil for up to 1 month. Thaw overnight in the fridge before heating.

Which apple variety is best for baking?

Firm, sweet-tart varieties like Honeycrisp, Gala, Fuji, or Granny Smith hold their texture best during baking and won't turn watery.

High-Protein Apple Cinnamon French Toast Bake

Gluten-Free • High-Protein • Make-Ahead Breakfast

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Prep Time 15 Mins

Cook Time 40 Mins

Total Time 55 Mins

Servings 4 Servings

Equipment Needed

• 8x11-inch or 9x13-inch baking dish
• Skillet
• Large mixing bowl or blender
• Measuring cups and spoons

Ingredients

• 8 cups gluten-free bread, cubed and dried
• 2 medium Honeycrisp apples, cored and small diced
• 1.5 cups liquid egg whites
• 2 large whole eggs
• 1/2 cup plain nonfat Greek yogurt
• 1 cup unsweetened almond milk
• 2 scoops (60g) vanilla protein powder
• 2 tsp ground cinnamon, divided
• 1/4 tsp ground nutmeg
• 1 tsp pure vanilla extract
• 2 tbsp pure maple syrup, divided

Instructions

1. Preheat oven to 350°F (175°C). Lightly grease an 8x11-inch baking dish.
2. Sauté diced apples with 1 tbsp maple syrup, 1 tsp cinnamon, and 2 tbsp water in a skillet for 5–6 minutes until softened.
3. In a bowl or blender, mix egg whites, whole eggs, Greek yogurt, almond milk, protein powder, 1 tsp cinnamon, nutmeg, vanilla, and 1 tbsp maple syrup until smooth.
4. Layer half the bread cubes into the dish, followed by half the apples. Repeat with remaining bread and apples.
5. Pour the liquid custard evenly over the top. Press bread down gently to soak. Let rest for 10–15 minutes.
6. Bake for 35–40 minutes until set and light golden brown on top. Let cool 10 minutes before slicing.

Nutrition (Per Serving)

Calories 340

Protein 31g

Carbs 38g

Fiber 5g

Fat 7g

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