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Beef and Spinach Stuffed Portobello Mushrooms

Name: Beef and Spinach Stuffed Portobello Mushrooms
Prep time: 15 min
Cook time: 25 min
Total time: 40 min
Yield: 4 servings
Cuisine: American
Ingredients: 4 large portobello mushroom caps, stems removed and wiped clean; 1 lb (450g) lean ground beef (90% lean); 2 cups fresh spinach, chopped; 1 small yellow onion, finely diced; 3 cloves garlic, minced; 1/4 cup grated Parmesan cheese; 1/4 cup shredded mozzarella cheese; 2 tablespoons olive oil, divided; 1 teaspoon dried oregano; 1/2 teaspoon crushed red pepper flakes (optional); Salt and freshly ground black pepper, to taste; Fresh parsley, chopped (for garnish)

By PowerProteinPlates Editorial TeamPublished Apr 9, 2026 | Updated Jul 22, 2026

American 40 mins high-proteingluten-freeeasy-recipeswhole-foods

Beef and Spinach Stuffed Portobello Mushrooms with measured ingredients, 40-minute timing, 4-serving yield, and step-by-step instructions for protein-focused meals, snacks, smoothies, and meal preparation.

Prep 15 min

Cook 25 min

Total 40 min

Servings 4

Difficulty easy

Cuisine American

Ingredients

Servings 4

4 large portobello mushroom caps, stems removed and wiped clean
1 lb (450g) lean ground beef (90% lean)
2 cups fresh spinach, chopped
1 small yellow onion, finely diced
3 cloves garlic, minced
1/4 cup grated Parmesan cheese
1/4 cup shredded mozzarella cheese
2 tablespoons olive oil, divided
1 teaspoon dried oregano
1/2 teaspoon crushed red pepper flakes (optional)
Salt and freshly ground black pepper, to taste
Fresh parsley, chopped (for garnish)

Powerproteinplates Low-Carb Beef and Spinach Stuffed Portobello Mushrooms ingredients image

Instructions

Preheat oven to 375°F (190°C).
Arrange portobello mushroom caps on a baking sheet, gill side up. Brush each cap with 1 tablespoon of olive oil and season lightly with salt and pepper. Roast for 10 minutes to soften. Remove from oven and set aside.
Heat the remaining 1 tablespoon of olive oil in a large skillet over medium heat. Sauté diced onion for 3-4 minutes until translucent.
Add minced garlic and cook an additional 1 minute until fragrant.
Add lean ground beef, breaking it apart with a spatula. Cook until browned, about 6-8 minutes. Drain excess fat if needed.
Stir in chopped spinach, dried oregano, crushed red pepper flakes (if using), salt, and pepper. Cook for 2-3 minutes until spinach wilts.
Remove skillet from heat and allow mixture to cool slightly. Stir in grated Parmesan cheese.
Spoon beef and spinach filling evenly into each roasted portobello cap.
Top each stuffed mushroom with shredded mozzarella cheese.
Return to oven and bake for 12-15 minutes, until cheese is melted and bubbly.
Garnish with fresh chopped parsley and serve hot as a nutritious post-workout meal.