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Instructions:
- Preheat the oven to 375°F (190°C). Lightly grease a baking dish.
- Clean the mushrooms and gently scoop out the centers if needed. Arrange the caps in the prepared baking dish.
- Melt the butter in a skillet over medium heat. Add the garlic and cook just until fragrant.
- Add the chopped spinach and cook until wilted. Remove from heat.
- In a mixing bowl, combine the cream cheese, sour cream, Parmesan, mozzarella, salt, pepper, and nutmeg.
- Stir in the spinach mixture until smooth and fully combined.
- Fill each mushroom cap generously with the spinach mixture.
- Sprinkle lightly with breadcrumbs, if using.
- Bake for 18–20 minutes, until the mushrooms are tender and the tops are lightly golden.
- Serve warm.
Variations
- Use baby bella mushrooms for a deeper, more robust flavor.
- Add finely chopped cooked bacon for a smoky twist.
- Substitute Gruyère for mozzarella for a more classic Rockefeller profile.
- Finish with a light broil for extra browning on top.
Tips
- Do not soak mushrooms in water; wipe them clean to avoid excess moisture.
- Soften cream cheese fully for the smoothest filling.
- Drain excess liquid from the spinach to keep the filling thick and creamy.
- For extra richness, drizzle a little melted butter over the mushrooms just before serving.