Transform hearty portobello mushrooms into an impressive main dish with this recipe for Spinach and Cheese Stuffed Portobellos. Perfect as a vegetarian entrée or sophisticated side dish, these stuffed mushrooms combine earthy flavors with creamy cheese and nutritious spinach for a meal that’s both elegant and satisfying.

Why This Recipe Works

The natural umami flavor of portobello mushrooms creates the perfect vessel for a creamy, cheesy spinach filling. The combination of different cheeses adds depth, while the spinach provides nutrients and a beautiful color contrast. These stuffed mushrooms can be prepared in advance and are equally suitable for casual dinners or special occasions.

Essential Ingredients

For the Mushrooms:

• 6 large portobello mushroom caps
• 2 tablespoons olive oil
• 2 cloves garlic, minced
• Salt and black pepper to taste
• 1 tablespoon balsamic vinegar

For the Filling:

• 2 packages (10 oz each) frozen spinach, thawed and drained
• 8 oz cream cheese, softened
• 1 cup ricotta cheese
• 1/2 cup grated Parmesan cheese
• 1 cup shredded mozzarella cheese
• 3 cloves garlic, minced
• 1 small onion, finely diced
• 1/4 teaspoon red pepper flakes
• 1/2 teaspoon dried oregano
• 1/4 teaspoon nutmeg

For Topping:

• 1/2 cup shredded mozzarella cheese
• 1/4 cup grated Parmesan cheese
• 2 tablespoons breadcrumbs (optional)
• Fresh herbs for garnish

Required Equipment

• Baking sheet
• Large skillet
• Mixing bowls
• Cheese grater
• Measuring cups and spoons
• Paper towels
• Spoon for stuffing
• Aluminum foil

Step-by-Step Instructions

Preparing the Mushrooms

1. Clean the mushrooms:

• Gently remove stems
• Wipe caps with damp paper towel
• Scrape out gills with spoon

1. Season mushrooms:

• Brush with olive oil
• Season with salt and pepper
• Drizzle with balsamic vinegar
• Let marinate 10 minutes

Making the Filling

1. Prepare the spinach:

• Squeeze out excess moisture
• Chop if needed
• Set aside

1. Sauté aromatics:

• Heat olive oil in skillet
• Cook onion until translucent
• Add garlic, cook until fragrant
• Let cool slightly

1. Mix the filling:

• Combine cream cheese and ricotta
• Add Parmesan and 1 cup mozzarella
• Mix in sautéed onion and garlic
• Stir in spinach
• Add seasonings and spices

Assembly and Baking

1. Preheat oven to 400°F (200°C)
2. Prepare mushrooms:

• Place caps on baking sheet
• Fill each cap generously
• Top with remaining cheese
• Sprinkle with breadcrumbs if using

1. Bake:

• Cook for 20-25 minutes
• Broil last 2-3 minutes if desired
• Let rest 5 minutes before serving

Pro Tips for Success

1. Mushroom Selection:

• Choose firm, fresh caps
• Similar sizes for even cooking
• Avoid wet or slimy spots
• Look for intact edges

1. Filling Tips:

• Room temperature cheese blends better
• Drain spinach thoroughly
• Season generously
• Don’t overfill caps

1. Baking Advice:

• Use middle rack position
• Watch carefully when broiling
• Let rest before serving
• Don’t overbake

Make-Ahead and Storage Options

Make-Ahead Tips:

• Prepare filling up to 2 days ahead
• Clean and season mushrooms day of
• Assemble just before baking

Storage Guidelines:

• Refrigerate leftovers up to 3 days
• Reheat in oven until warm
• Not recommended for freezing
• Store filling separately if needed

Variations and Adaptations

Different Greens:

• Fresh spinach (sautéed)
• Kale
• Swiss chard
• Arugula

Cheese Options:

• Goat cheese
• Fontina
• Gruyere
• Feta

Additional Add-ins:

• Sun-dried tomatoes
• Artichoke hearts
• Pine nuts
• Roasted red peppers

Serving Suggestions

As Main Course:

• Serve with salad
• Quinoa or rice
• Roasted vegetables
• Crusty bread

As Side Dish:

• Pair with grilled meats
• Serve alongside pasta
• Complete a vegetarian spread
• Add to buffet table

Nutritional Benefits

• High in protein
• Rich in vitamins
• Good source of minerals
• Low in carbohydrates
• Heart-healthy fats

Troubleshooting Tips

Watery Mushrooms:

• Don’t wash, just wipe clean
• Remove gills completely
• Pre-bake caps if needed
• Drain excess liquid

Filling Issues:

• Ensure spinach is well-drained
• Don’t overmix cheese
• Season adequately
• Check consistency before filling

Cooking Problems:

• Check oven temperature
• Watch for excess browning
• Adjust rack position
• Use proper size baking sheet

This Spinach and Cheese Stuffed Portobello recipe creates an impressive dish that’s perfect for any occasion. Whether served as a vegetarian main course or an elegant side dish, these stuffed mushrooms offer a delicious combination of flavors and textures that will satisfy both vegetarians and meat-eaters alike.