Spinach and Mushroom Egg White Frittata: An Easy, Protein-Rich Breakfast

This spinach and mushroom egg white frittata is light, savory, and easy to prepare in one oven-safe skillet. Fresh spinach, mushrooms, onion, and garlic add vegetables and flavor, while carton egg whites make the recipe quick and convenient.

It is a useful make-ahead breakfast for people who want a lower-carbohydrate, protein-forward option. To make it a more complete meal, serve it with a measured carbohydrate such as whole-grain toast, beans, fruit, or oats if that fits your eating plan.

This recipe is for general education and is not a substitute for individualized medical or dietary advice. If you manage diabetes, take glucose-lowering medication, or have kidney, heart, or cholesterol concerns, ask your healthcare professional or registered dietitian how this meal fits your plan.

Recipe at a glance

• Makes: 2 servings
• Prep time: 10 minutes
• Cook time: 12 to 15 minutes
• Total time: About 25 minutes
• Difficulty: Easy
• Equipment: 8-inch oven-safe skillet, mixing bowl, spatula

Estimated nutrition

Per serving, using the ingredients listed and dividing the frittata into two portions:

• Calories: About 90
• Protein: About 12 grams
• Carbohydrates: About 4 grams
• Fat: About 2 grams
• Fiber: About 1 gram

These are estimates, not laboratory measurements. Brand, egg-white product, vegetable size, oil amount, and optional toppings will change the final numbers. For the most accurate result, calculate the recipe with the exact products you use.

Ingredients

• 1 cup liquid egg whites, or about 8 large egg whites
• 1 teaspoon olive oil
• 1 cup fresh spinach, roughly chopped
• 1/2 cup sliced mushrooms
• 1/4 cup finely chopped onion
• 1 garlic clove, minced
• 1/4 teaspoon black pepper
• A small pinch of salt, optional
• Halved cherry tomatoes and fresh herbs, optional for serving

How to make a spinach and mushroom egg white frittata

1. Heat the oven and prepare the pan

Heat the oven to 375°F (190°C). Lightly coat an 8-inch oven-safe skillet with cooking spray or a small amount of olive oil. If your skillet is not oven-safe, use a nonstick skillet to cook the vegetables, then transfer everything to a lightly greased small baking dish.

2. Cook the vegetables

Warm the olive oil over medium heat. Add the onion and cook for about 2 minutes, until it begins to soften. Add the mushrooms and garlic and cook for 3 to 4 minutes, stirring occasionally, until the mushrooms release their moisture and become tender.

Add the spinach and cook just until wilted. If the pan looks very wet, cook for another minute so excess moisture can evaporate. Watery vegetables can make the finished frittata soft or difficult to slice.

3. Add the egg whites

Whisk the egg whites with the black pepper and optional salt. Pour them over the vegetables and gently spread the mixture into an even layer. Avoid stirring once the egg whites begin to set.

4. Bake until set

Transfer the skillet to the oven and bake for 10 to 12 minutes. The frittata is ready when the center is set and no liquid moves when the pan is gently shaken. For food safety, egg dishes should reach 160°F (71°C) when checked with a food thermometer.

5. Rest, slice, and serve

Remove the skillet carefully—the handle will be hot. Let the frittata rest for 2 to 3 minutes, then slice it into two portions. Finish with cherry tomatoes, fresh herbs, or black pepper if desired.

How to serve it for a balanced breakfast

Egg whites provide protein, but this frittata is not intended to be a complete eating plan by itself. The CDC’s plate method uses nonstarchy vegetables, protein, and a portion of carbohydrate as a framework for building balanced meals. Read the CDC’s diabetes meal-planning guidance.

Try one of these combinations:

• One serving of frittata with a slice of whole-grain toast
• Frittata with a small portion of berries and plain Greek yogurt
• Frittata with a side of beans and sliced tomatoes
• Frittata with roasted vegetables and a measured portion of oats

The right carbohydrate amount depends on your medication, activity, glucose targets, and personal plan. The same breakfast can affect different people differently, so avoid promises such as “won’t spike blood sugar.”

For more morning ideas, see our easy diabetic breakfast recipes guide and our collection of diabetic breakfast recipes with eggs.

Tips for the best texture

• Squeeze thawed frozen spinach. Frozen spinach works, but thaw it completely and press out excess water before adding it.
• Cook down the mushrooms. Mushrooms release water as they cook. Let that moisture evaporate before adding the egg whites.
• Do not overbake. Egg whites become rubbery when cooked for too long. Start checking at 10 minutes.
• Use a smaller pan. An 8-inch skillet makes a thicker frittata that is easier to slice. A larger pan will produce a thinner frittata and may need less time.
• Season in layers. Garlic, pepper, herbs, and a small amount of salt add flavor without relying on a large amount of cheese or processed meat.

Easy variations

Add more vegetables

Add finely diced bell pepper, zucchini, asparagus, or broccoli. Cook firmer vegetables with the onion so they soften before the egg whites go in.

Use whole eggs

For a richer texture, replace part of the egg whites with two or three whole eggs. This will increase the calories, fat, and cholesterol compared with the version made entirely with egg whites. If you have been advised to limit cholesterol or saturated fat, ask your healthcare professional which version is appropriate for you.

Add cheese

Sprinkle a small amount of feta, Parmesan, or reduced-fat cheddar over the top before baking. Cheese adds flavor but also increases sodium and, depending on the variety, saturated fat.

Make it herb-forward

Add fresh dill, basil, parsley, chives, or tarragon just before serving. A squeeze of lemon can also brighten the spinach and mushrooms.

Turn it into egg muffins

Divide the cooked vegetable mixture among greased muffin cups, pour the egg whites over it, and bake at 350°F (175°C) until set, usually about 18 to 22 minutes. Begin checking early because ovens and muffin-pan sizes vary.

Storage and reheating

Cool leftovers promptly and transfer them to a covered container. Refrigerate for up to 3 to 4 days. USDA guidance lists egg casseroles at 3 to 4 days in the refrigerator; use the same conservative window for this baked egg dish. See the USDA egg-storage chart.

Reheat one portion in the microwave in short intervals or in a low oven until hot throughout. If freezing, slice the frittata first, wrap portions well, and thaw them in the refrigerator. The texture may be softer after freezing and thawing.

Frequently asked questions

More breakfast recipes

• Diabetic breakfast recipes with eggs
• Spinach and feta omelet
• Diabetic breakfast casserole
• Vegan egg muffins
• What is the diabetes plate method?

Final takeaway

This spinach and mushroom egg white frittata is a simple way to combine protein and nonstarchy vegetables in a make-ahead breakfast. Serve it on its own or add a measured carbohydrate that fits your eating plan. Make the recipe your own with seasonal vegetables and herbs, and use your healthcare team’s guidance for individual diabetes nutrition decisions.

This article is for general educational purposes only and is not medical advice. Nutrition needs vary, especially for people who use insulin or other glucose-lowering medicines or who have kidney, heart, or cholesterol concerns. Speak with your healthcare professional or registered dietitian before making major changes to your eating pattern.

Sources

• American Diabetes Association: Eating for Diabetes Management
• CDC: Diabetes Meal Planning
• USDA FSIS: Shell Eggs from Farm to Table
• USDA FoodData Central

By Lylia, Home Cook & Recipe Developer · Medically reviewed by Dr. Sarah Jenkins, MD · Published July 25, 2026 · Last reviewed October 20, 2026