10 ounces baby spinach
2 tablespoons olive oil, plus more for brushing
1 onion, minced
2 garlic cloves, minced
½ cup grated Parmesan cheese
4 ounces fresh mozzarella cheese, diced
1 cup ricotta cheese
Sea salt
Freshly ground black pepper
Rinse the spinach but do not dry it.
In a large skillet, heat the olive oil over medium heat. Add the onion and cook, stirring occasionally, until translucent, about 4 minutes. Stir in the garlic and cook until fragrant, about 1 minute. Add the spinach, cover, and cook until tender, about 3 minutes.
Drain the spinach mixture in a sieve, pressing gently to remove excess liquid. Transfer to a bowl, add the Parmesan, mozzarella, and ricotta cheeses, and mix well. Season with salt and pepper to taste.
Proceed with the main recipe.