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Instructions:
- Preheat the oven to 375°F (190°C) and lightly butter a small baking dish.
- If using fresh spinach, sauté briefly until wilted, then drain and squeeze out all excess moisture.
- In a skillet over medium heat, melt the butter with the olive oil.
- Add the onion or shallot and cook until soft and translucent, about 3 minutes.
- Stir in the garlic and cook for about 30 seconds, until fragrant.
- Add the cream cheese and heavy cream, stirring until smooth and fully combined.
- Season with nutmeg, salt, and black pepper.
- Fold in the spinach until evenly coated with the creamy mixture.
- Transfer the spinach mixture to the prepared baking dish.
- Sprinkle mozzarella and Parmesan evenly over the top.
- Bake for 20 to 25 minutes, until bubbly and lightly golden.
- Let rest for 5 minutes before serving hot.
Variations
- Add finely chopped mushrooms for extra depth and earthiness.
- Substitute Gruyère for mozzarella for a nuttier, steakhouse-style flavor.
- Stir in a spoonful of sour cream for added tang.
- Finish under the broiler for a deeper golden crust.
Tips
- Squeeze spinach extremely dry to prevent a watery texture.
- Use freshly grated cheese for the smoothest melt.
- Do not skip the nutmeg; it provides signature Rockefeller depth.
- Let the dish rest briefly after baking so it sets beautifully before serving.