Egg White and Spinach Stuffed Portobello

Egg White and Spinach Stuffed Portobello

Mia

This Egg White and Spinach Stuffed Portobello transforms humble mushroom caps into a protein-packed breakfast masterpiece that's perfectly aligned with Optavia's Lean & Green guidelines. The meaty portobello mushrooms serve as edible bowls, their earthy, umami-rich flavor providing the perfect foundation for fluffy egg whites and vibrant fresh spinach. As the dish bakes, the mushrooms release their natural moisture while the egg whites set into a light, cloud-like filling that's both satisfying and incredibly nutritious.

What makes this recipe truly special is its ability to deliver restaurant-quality flavor while keeping calories remarkably low. The portobello caps, when roasted, develop a deep, savory taste that rivals any traditional breakfast meat, while the egg whites provide pure protein without any fat. Fresh spinach wilts into the mixture, adding iron, vitamins, and a pop of color that makes each bite as visually appealing as it is delicious. A touch of garlic and herbs elevates the simple ingredients into something extraordinary.

This dish is ideal for meal prep enthusiasts and busy mornings alike. The portobellos can be cleaned and prepped the night before, and the entire recipe comes together in under 30 minutes from start to finish. Each serving delivers an impressive protein boost with minimal carbohydrates, making it an excellent choice for anyone following a structured weight management program. The combination of textures—from the tender mushroom to the fluffy eggs—creates a breakfast experience that feels indulgent while keeping you firmly on track with your health goals.

Mia

Mia

Recipe Author: Welcome to Mia's Kitchen, where every recipe is plant-forward, anti-inflammatory, and full of flavor. Her meals make it easy to eat well, support gut health, and enjoy balanced, wholesome cooking at home.

Nutrition

28 minutes
None servings
95 calories
Fat 1.50g
Carbs 7.00g
Protein 15.00g

Ingredients

2 wholelarge portobello mushroom caps, stems removed and gills scraped out
1 cupegg whites, from carton or about 8 large eggs
2 cupsfresh spinach, roughly chopped
1 clovegarlic, minced
1/4 tsponion powder
1/4 tspsalt
1/8 tspblack pepper, freshly ground
1/4 tspdried Italian seasoning
as needed Nonecooking spray, non-stick
1 tbspfresh parsley, chopped (optional)

Equipment

Cutting board
Baking sheet
Oven
Whisk
paper towels
knife
spoon
medium mixing bowl
measuring cups and spoons
cooking spray
small non-stick skillet

High-Protein Diet

Perfectly aligned with high-protein diet principles, this recipe delivers a substantial protein boost from egg whites while keeping the meal light and nutritious, making it an ideal protein-focused dish.

Intermittent Fasting

An excellent choice for intermittent fasting with its high-protein, nutrient-dense ingredients that provide sustained energy and satiety during eating windows, while being low in calories and carbohydrates.

Ketogenic Diet

Perfectly aligned with keto requirements, this recipe is low in carbs (approximately 3-4g net carbs from portobello and spinach), high in protein from egg whites, and uses healthy cooking methods that minimize added fats.

Low-Carb Diet

An ideal low-carb option with only 3-4g net carbs per serving, featuring non-starchy portobello mushrooms as a base and lean protein from egg whites, making it perfect for those limiting carbohydrate intake.

Optavia

This recipe is specifically designed to meet Optavia's Lean & Green guidelines, featuring a low-calorie preparation with lean protein (egg whites) and non-starchy vegetables, making it an ideal Optavia-compliant meal.

Instructions

1

Preheat your oven to 375°F and position the rack in the middle of the oven.

2 min
2

Clean the portobello mushroom caps gently with a damp paper towel to remove any dirt. Remove the stems and use a spoon to scrape out the dark gills from the underside of each cap.

3 min
3

Lightly spray a baking sheet with cooking spray and place the mushroom caps gill-side up on the sheet.

4

Place the mushroom caps in the preheated oven and bake for 5 minutes to release some of their moisture.

5 min
5

While the mushrooms are pre-baking, heat a small non-stick skillet over medium heat and spray with cooking spray.

1 min
6
1 min

Add the minced garlic to the skillet and cook for 1 minute, stirring constantly, until fragrant.

7
3 min

Add the chopped spinach and kale to the skillet. Cook for 2-3 minutes, stirring frequently, until the greens are wilted and any excess moisture has evaporated.

8

Remove the skillet from heat and let the spinach mixture cool for 2 minutes.

2 min
9

In a medium mixing bowl, whisk together the egg whites, onion powder, salt, black pepper, and Italian seasoning until well combined.

1 min
10

Add the cooled spinach and garlic mixture to the egg whites and stir gently to combine.

11

Remove the mushroom caps from the oven and carefully pour off any liquid that has accumulated in the caps.

12

Divide the egg white and spinach mixture evenly between the two mushroom caps, pouring it into the center of each cap.

13

Return the stuffed mushrooms to the oven and bake for 12-15 minutes, until the egg whites are fully set and the tops are lightly golden.

13 min
14

Remove from the oven and let cool for 3-5 minutes. Garnish with fresh chopped parsley if desired and serve immediately.

2 min

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