Name: Keto Egg Casserole with Broccoli, Red Bell Peppers, Mushrooms, and Cheddar Recipe
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: American
Ingredients: 6 large eggs; 1/4 cup heavy cream; 1/2 teaspoon salt; 1/4 teaspoon black pepper; 1 cup broccoli florets, chopped; 1/2 cup red bell pepper, diced; 1/2 cup mushrooms, sliced; 1 cup shredded cheddar cheese; 1 tablespoon olive oil (for greasing and sautéing vegetables)

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I absolutely love starting my day with a hearty meal that feels both indulgent and nourishing, and this Keto Egg Casserole with Broccoli, Red Bell Peppers, Mushrooms, and Cheddar Recipe fits the bill perfectly. It’s a vibrant, fluffy casserole that combines fresh vegetables and rich cheddar cheese, making it a meal that’s satisfying without weighing me down. Each bite bursts with flavor and texture, and it’s a wonderful way to enjoy a low-carb breakfast or brunch that feels special every single time.

Why You'll Love This Keto Egg Casserole with Broccoli, Red Bell Peppers, Mushrooms, and Cheddar Recipe

One of the reasons I adore this recipe is the incredible flavor profile it delivers. The earthiness of sautéed mushrooms pairs beautifully with the slight sweetness of red bell peppers and the fresh crunch of broccoli, all balanced by the creamy, melted cheddar cheese. Every bite is a comforting, savory delight that makes it easy to forget I'm sticking to a keto lifestyle. Nothing about it feels bland or boring, and that keeps me coming back for more.

This casserole is also super easy to throw together, which is a huge plus for busy mornings or casual weekend brunches. I simply whisk my eggs and cream, toss in the veggies and cheese, and pop it in the oven. No fuss, no complicated steps, and minimal cleanup. Plus, it’s incredibly versatile; I often make it ahead for meal prep or serve it fresh for company. It’s perfect for everything from a cozy family breakfast to a fancy brunch gathering where you want to impress with minimal effort.

Ingredients You'll Need

The image shows nine small bowls arranged in a neat grid on a white marbled surface. The top left bowl is white and holds four whole eggs. Next to it is a smaller bowl with a pale granular powder, and to the right is a bowl filled with bright green broccoli florets. Below the eggs, a bowl contains shredded yellow cheese. In the middle, a bowl holds whole brown mushrooms, and next to it, another bowl has a thick, creamy off-white sauce. At the bottom left, a bowl is filled with red bell pepper strips, and beside it is a bowl of sliced white mushrooms with dark gills. Finally, at the bottom right, a small glass bowl contains golden olive oil. Photo taken with an iphone --ar 4:5 --v 7

The ingredients for this Keto Egg Casserole with Broccoli, Red Bell Peppers, Mushrooms, and Cheddar Recipe are simple but essential. Each component brings its own unique contribution—whether it's the bright color, the texture, or the rich flavor—that makes the dish so special and inviting.

Quick Tip

All ingredient amounts are listed in the recipe card below

6 large eggs: These create the fluffy base and hold everything together perfectly.
1 cup broccoli florets, chopped: Adds a fresh crunch and vibrant green color to the casserole.
½ cup red bell pepper, diced: Brings sweetness and a beautiful pop of red that brightens the dish.
½ cup mushrooms, sliced: Offers an earthy, savory depth that complements the cheese beautifully.
1 cup shredded cheddar cheese: Melts into the eggs for a creamy, cheesy richness that’s irresistible.
¼ cup heavy cream: Adds moisture and keeps the eggs tender and luscious.
1 tablespoon olive oil: Perfect for greasing the dish and sautéing the vegetables to perfection.
½ teaspoon salt: Essential for enhancing all the natural flavors.
¼ teaspoon black pepper: Adds a subtle kick to balance the richness.

Directions

Step 1: Preheat your oven to 375°F (190°C). Lightly grease your baking dish with olive oil to prevent sticking and add a little extra flavor.

Step 2: In a skillet, heat half the olive oil over medium heat and sauté the broccoli, red bell peppers, and mushrooms just until they start to soften—about 3 to 4 minutes. This step releases their flavors and ensures they don’t add excess moisture to your casserole.

Step 3: In a large mixing bowl, whisk together the eggs, heavy cream, salt, and black pepper until fully combined and slightly frothy. This will give the casserole a lovely light texture.

Step 4: Stir in the shredded cheddar cheese and the sautéed vegetables gently into the egg mixture, making sure everything is evenly distributed.

Step 5: Pour the mixture into your prepared baking dish, spreading it out evenly to help it cook through uniformly.

Step 6: Bake in the preheated oven for 25 to 30 minutes, or until the eggs are fully set and the top turns a lovely light golden brown. You’ll know it’s ready when a knife inserted comes out clean.

Step 7: Remove the casserole from the oven and let it cool for about 5 minutes. This helps it set further so you can slice it neatly.

Step 8: Slice into squares and serve warm. I love adding fresh avocado slices or a crisp salad on the side for a complete meal.

Servings and Timing

This recipe makes about 4 generous servings, perfect for a small family breakfast or brunch. Prep time is a quick 10 minutes, mostly chopping and whisking, and the bake time runs around 30 minutes. Allow an additional 5 minutes for cooling before serving, bringing your total time to roughly 45 minutes from start to finish. It’s realistically efficient for weekdays or weekends when you want something satisfying without spending the whole morning in the kitchen.

How to Serve This Keto Egg Casserole with Broccoli, Red Bell Peppers, Mushrooms, and Cheddar Recipe

A round frittata sits in the center of a white plate on a white marbled surface. The frittata has a light golden yellow egg base with small pockets of melted cheese visible throughout. On top, there are cooked broccoli florets in dark green with textured surfaces, slices of brown mushrooms with smooth caps, and bright red bell pepper pieces scattered evenly. The edges of the frittata are slightly browned, showing a crisp texture. The lighting highlights the glossy finish of the cooked vegetables and cheese. Photo taken with an iphone --ar 4:5 --v 7

When I serve this keto egg casserole, I often pair it with light, fresh sides like a crisp arugula salad dressed simply with lemon juice and olive oil. The peppery greens balance the richness of the eggs beautifully. For something heartier, sliced avocado or a dollop of sour cream adds creaminess and boosts the fat content, keeping it keto-friendly and scrumptious.

I like to garnish the casserole with a sprinkle of fresh herbs like chives or parsley for a burst of color and freshness. It really elevates the presentation and makes it feel like a special meal, perfect for sharing with friends or family. Plus, it tastes amazing whether served hot right out of the oven or at room temperature, which is great if you’re feeding a crowd or need an easy-to-serve brunch dish.

For drinks, I usually go with a chilled sparkling water with a splash of lime or a fresh herb-infused iced tea to keep things light and refreshing. If it’s a celebratory brunch, a crisp dry white wine or a classic mimosa pairs beautifully with the creamy cheddar and savory vegetables. It’s such a versatile recipe for so many occasions—lazy weekend mornings, holiday gatherings, or quick keto dinners during busy weeks.

Variations

One of the things I enjoy most about this Keto Egg Casserole with Broccoli, Red Bell Peppers, Mushrooms, and Cheddar Recipe is how adaptable it is. You can easily swap out the vegetables for whatever you have on hand or prefer—spinach, zucchini, or even some diced bacon for an extra savory kick. Changing the cheese is another easy way to mix things up; try pepper jack for a bit of heat or mozzarella for a milder flavor.

If you’re following a strict keto diet but want to keep it dairy-free, I’ve had success using coconut cream in place of heavy cream and nutritional yeast as a cheesy substitute, though it’ll change the flavor profile. For those who want to make this recipe vegan, I recommend switching to a chickpea flour or tofu base instead of eggs, but keep in mind the texture will be quite different. Baking the casserole in individual ramekins is a fun method if you want easy portion control or to serve a crowd with different flavor choices.

Another variation I love is adding fresh herbs like thyme or rosemary into the egg mixture for an herby twist. Or sprinkling a bit of smoked paprika on top before baking adds a subtle smokiness that compliments the mushrooms perfectly. Feel free to experiment with seasoning to make it your own—it’s the perfect dish to customize while keeping it simple and satisfying.

Storage and Reheating

Storing Leftovers

I usually store leftovers of this keto egg casserole in an airtight container in the refrigerator. It keeps well for up to 3 to 4 days. To keep the texture just right, I recommend covering the casserole loosely with plastic wrap if you’re storing it directly in the baking dish. This way, it stays moist but doesn’t get soggy.

Freezing

This casserole freezes quite well, which makes it a fantastic make-ahead meal. I let it cool completely, then wrap portions tightly in plastic wrap and place them in a freezer-safe container or bag. It can be frozen for up to 2 months. When you’re ready, simply thaw overnight in the fridge before reheating for best results.

Reheating

To reheat, I find the best way is to warm individual slices in a preheated oven at 325°F (160°C) for about 10 to 15 minutes. This helps retain the fluffy texture and prevents it from drying out. Microwaving works in a pinch but can sometimes make the eggs rubbery or unevenly heated. Covering with foil while reheating in the oven helps keep the moisture locked in and the cheese melty.

FAQs

Can I make this casserole ahead of time?

Absolutely! I often prepare it the night before and bake it fresh in the morning, or bake it fully and reheat later. Either way, it holds its flavor and texture beautifully, making it perfect for busy mornings or brunch prep.

Can I add meat to the recipe?

Yes, adding cooked bacon, sausage, or diced ham works wonderfully. I usually sauté them with the vegetables, or sprinkle cooked meats on top before baking for extra protein and flavor.

Is this recipe suitable for meal prep?

Definitely. It’s a great keto meal prep option since it stores well and reheats easily. I like to divide it into portions for breakfasts or lunches during the week to save time and stay on track with my diet.

How can I make this recipe dairy-free?

You can substitute the cheddar cheese with a dairy-free cheese alternative and swap heavy cream with full-fat coconut milk or another non-dairy cream. The texture and flavor will vary slightly but it remains delicious and keto-friendly.

Can I increase the vegetable quantity without changing cooking time?

Yes, adding a bit more vegetables is fine, but you may want to slightly extend the baking time by 5 minutes to ensure the eggs set completely and the vegetables cook through without making the casserole watery.

Conclusion

I'm genuinely excited for you to try this Keto Egg Casserole with Broccoli, Red Bell Peppers, Mushrooms, and Cheddar Recipe because it’s one of those dishes that brings both joy and comfort to the table. It’s flavorful, easy to prepare, and flexible enough to suit your tastes and lifestyle. I promise once you make it, it’ll become a favorite in your meal rotation as it is in mine. Enjoy every satisfying bite—you deserve it!

Keto Egg Casserole with Broccoli, Red Bell Peppers, Mushrooms, and Cheddar Recipe

Why You'll Love This Keto Egg Casserole with Broccoli, Red Bell Peppers, Mushrooms, and Cheddar Recipe