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Instructions:
- Preheat the oven to 400°F (205°C). Lightly grease a baking dish.
- Brush the portobello caps with olive oil and season lightly with salt and black pepper. Place them gill-side up in the baking dish.
- Melt the butter in a skillet over medium heat. Add the garlic and sauté for about 30 seconds, until fragrant.
- Add the chopped spinach and cook just until wilted. Remove from heat.
- Stir the cream cheese, mozzarella, Parmesan, and nutmeg into the spinach mixture until smooth and creamy.
- Spoon the spinach and cheese mixture evenly into each mushroom cap.
- Bake uncovered for 18–20 minutes, until the mushrooms are tender and the filling is bubbly and lightly golden.
- Let rest for 3–5 minutes before serving.
Variations
- Add crumbled bacon for a smoky, savory upgrade.
- Swap mozzarella for Gruyère for a nuttier, steakhouse-style flavor.
- Stir in finely chopped artichokes for extra texture.
- Sprinkle breadcrumbs on top for a lightly crisp finish.
Tips
- Do not overbake, as mushrooms can release too much moisture.
- Use full-fat cream cheese for the richest texture.
- A quick broil at the end enhances color and flavor.
- Serve immediately while hot and melty for the best experience.