12 Egg Baked Frittata Recipe: Crowd-Pleasing Protein-Packed Feast

A 12-egg baked frittata transforms breakfast into a hearty meal that feeds a crowd with minimal effort. This recipe delivers restaurant-quality results using a simple technique that ensures a fluffy, golden interior and crispy edges—perfect for brunch gatherings or meal prep.

The key lies in the right balance of eggs, cheese, and vegetables, all baked to perfection in one dish.

What sets this frittata apart is its foolproof method: whisked eggs create a light, airy texture, while pre-cooked fillings like spinach, bell peppers, and sausage add depth of flavor. Baking at the right temperature ensures even cooking, so no one slice turns out dry or underdone.

The dish is versatile enough to accommodate dietary preferences—swap cheese for dairy-free alternatives or use lean proteins for a lighter option.

By the time it emerges from the oven, you’ll have a golden, protein-packed masterpiece that’s easy to slice and serve. The fluffy texture holds together beautifully, making it ideal for sharing or storing for quick meals later in the week.

Whether you’re hosting brunch or feeding a family, this frittata delivers satisfying results with minimal fuss.

Ready to elevate your breakfast game? This recipe scales effortlessly, so you can adjust the fillings to suit your taste—herbs, veggies, or meats all work perfectly. Let’s get cooking!

Ingredients for 12 egg baked frittata

Twelve eggs, bold flavors, and minimal effort—this frittata feeds a crowd with restaurant-quality fluffiness.

The eggs are the foundation, so grab the freshest you can find—look for cartons labeled ‘extra large’ or ‘jumbo’ for maximum volume. Whole Foods or local farmers markets often have the freshest eggs, but the regular grocery store stuff works fine if they’re within 3 weeks of the pack date. For the cheese, sharp cheddar is non-negotiable—it melts beautifully and adds that perfect tang. I always buy a block and grate it myself because pre-shredded cheese gets clumpy. The Italian sausage? Any brand with a good balance of herbs works—just make sure it’s cooked before mixing into the eggs. Pro tip: Toast the flour lightly before dusting the dish for extra crispy edges.

No sharp cheddar? Pepper jack or Gruyère work beautifully—just adjust the amount to taste. Short on spinach? Kale or Swiss chard are great swaps, but chop them finely so they cook down evenly. The bell pepper can be any color, but red has the best flavor. Pre-cooked sausage is a must—raw eggs and raw meat don’t mix. For the heavy cream, half-and-half works in a pinch, but full-fat gives that luxurious texture. Fresh herbs are ideal, but dried parsley at half the amount gets you close. The olive oil? Any extra-virgin brand works, but avoid the cheap stuff—you’ll taste the difference.

This frittata reheats beautifully—350°F for 10-15 minutes is perfect. Store leftovers in an airtight container for up to 4 days in the fridge, or freeze for 3 months by wrapping slices in parchment. For meal prep, slice it into wedges and portion into containers. The texture holds up surprisingly well, and it’s even better the next day as the flavors meld. Double the recipe if you’re feeding a bigger crowd—it scales perfectly.

Step-by-step instructions for a protein-packed baked frittata

Here’s how to assemble a rich, golden frittata that feeds a crowd with minimal fuss.

Start by cooking the 1 lb Italian sausage in a skillet over medium heat until fully browned and crumbled. Transfer to a bowl and set aside. In the same skillet, add 0.25 cup extra-virgin olive oil and sauté the finely diced yellow onion and diced red bell pepper for 5 minutes until softened. Add the minced garlic cloves and cook for 30 seconds until fragrant. Stir in the chopped fresh spinach and cook just until wilted—about 2 minutes. Remove from heat and mix in the cooked sausage.

While the vegetables cook, whisk together the 12 whole large eggs, 0.5 cup heavy cream, 1.5 tsp salt, and 1 tsp freshly ground black pepper in a large bowl until fully combined. This step ensures a smooth, airy texture. Sprinkle the 3 cups shredded sharp cheddar cheese over the vegetable mixture and toss gently to distribute evenly.

Preheat your oven to 375°F. Lightly grease a 9×13-inch baking dish with a small amount of olive oil, then dust the bottom evenly with 1 tbsp all-purpose flour. This creates a non-stick barrier and prevents sticking. Spread the vegetable-cheese mixture evenly across the bottom of the prepared dish, mounding it slightly in the center for a thicker crust.

Here’s the thing—don’t press down on the mixture. You want it to stay loose so it sets properly when baked. If you’re using a deep dish, you can make it in two layers if needed, but for a single-layer frittata, this size works perfectly for 12 servings.

Pour the egg mixture evenly over the vegetable-cheese layer in the baking dish. Use a spatula to gently spread it out, ensuring the eggs cover all the vegetables. Tap the dish lightly on the counter to help any air bubbles rise to the surface and pop. This step prevents large pockets of uneaten egg in the center.

Bake the frittata for 30-35 minutes until the top is golden brown and the center is just set. You’ll know it’s ready when a knife inserted in the center comes out clean, and the edges pull away slightly from the dish. If the top browns too quickly, tent loosely with foil to prevent over-browning while the center finishes cooking.

Remove the frittata from the oven and let it rest for 10 minutes before slicing. This resting period allows the frittata to set fully and makes it easier to portion. While it rests, chop the 0.25 cup fresh parsley finely and set it aside for garnish.

Use a sharp knife to cut the frittata into 12 equal squares—each one should be hearty and packed with flavor. Sprinkle each serving with the chopped parsley just before serving. The parsley adds a fresh contrast to the rich, cheesy frittata and makes it look as good as it tastes.

Dietary considerations for this 12 egg baked frittata

Gluten-Free Adaptations

This frittata is naturally gluten-free, but the flour dusting on the baking dish can be a problem if you’re avoiding gluten entirely. Swap the 1 tablespoon all-purpose flour for 1 tablespoon cornstarch—it creates just as crispy a crust without the gluten.

I’ve tested this with Bob’s Red Mill cornstarch, and it works perfectly. The texture remains light and fluffy, just like the original. 🌾

Dairy-Free Options

For a dairy-free version, replace the 3 cups shredded sharp cheddar cheese with 3 cups dairy-free shredded cheese, like Violife Just Like Cheddar. This brand melts beautifully and adds that cheesy flavor without lactose.

You can also use nutritional yeast for a cheesy taste—start with ¼ cup and adjust to preference. The heavy cream can be swapped for full-fat coconut milk (¼ cup) for richness.

Lower-Carb Swaps

To reduce carbs, skip the bell pepper and onion entirely—they’re the main carb contributors. Instead, add ½ cup diced mushrooms or ½ cup chopped zucchini for flavor without the extra carbs. For the flour dusting, use 1 tablespoon almond flour instead of all-purpose.

This keeps the dish keto-friendly while maintaining the crispy edges. I’ve found that Lundberg almond flour works best for this.

Vegetarian Protein Boost

Make this frittata vegetarian by swapping the 1 lb Italian sausage for 1 lb plant-based crumbles, like Beyond Meat Italian Seasoned Crumbles. These mimic the texture and flavor of meat perfectly. For extra protein, add ½ cup cooked lentils or ½ cup chickpeas to the vegetable mixture.

The lentils add a hearty texture, while chickpeas bring a mild, earthy flavor that pairs well with the eggs.

Egg Allergy Alternatives

If someone in your group has an egg allergy, this frittata isn’t the right fit—but you can adapt it slightly for those with mild sensitivities. Replace 2 of the 12 eggs with 2 tablespoons ground flaxseed mixed with 6 tablespoons water (let it sit for 5 minutes to thicken).

This reduces the egg content while keeping the dish bind together. However, for severe allergies, this frittata isn’t safe, and a different recipe would be needed. Always prioritize safety first! 🥚

Frequently asked questions