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Instructions:
- Preheat the oven to 375°F (190°C) and lightly grease a baking dish.
- Clean the mushrooms with a damp paper towel and arrange them hollow-side up in the prepared dish.
- Melt the butter in a skillet over medium heat. Add the garlic and cook for about 30 seconds, until fragrant.
- Add the chopped spinach and cook just until wilted, then remove from heat.
- In a bowl, combine the cream cheese, Parmesan cheese, mozzarella cheese, heavy cream, salt, pepper, and optional nutmeg or red pepper flakes. Mix until smooth.
- Stir the spinach mixture into the cheese filling until fully incorporated.
- Spoon the filling generously into each mushroom cap.
- Bake uncovered for 18–22 minutes, until the mushrooms are tender and the tops are lightly golden.
- Serve hot as an elegant appetizer or a steakhouse-style side dish.
Variations
- Add finely chopped mushroom stems to the filling for extra flavor and texture.
- Substitute mozzarella with Gruyère or provolone for a deeper, nuttier taste.
- Top with a light sprinkle of extra Parmesan before baking for added crispness.
Tips
- Choose mushrooms of similar size to ensure even cooking.
- Finely chop the spinach for a smoother, more luxurious filling.
- For a classic Ruth’s Chris finish, broil for the final 1–2 minutes to achieve a lightly browned, bubbly top, watching closely to prevent burning.