Gratinado de pasta cremosa con espinacas

Ingredientes

• Pasta (1 lb / 450g): Choose a short, sturdy pasta like penne, rigatoni, ziti, or fusilli. Their shapes are ideal for capturing every drop of the luxurious cream sauce.
• Unsalted Butter (4 tablespoons): This forms the base of our roux, creating a rich foundation for the béchamel sauce.
• Yellow Onion (1 medium): Finely chopped, the onion adds a subtle, sweet aromatic depth that builds the first layer of flavor.
• Garlic (4 cloves): Minced finely. Don’t be shy with the garlic; it’s essential for punching up the flavor and complementing the creamy elements.
• All-Purpose Flour (1/4 cup): This is our thickening agent. When cooked with the butter, it creates a roux that ensures a smooth, thick, and stable sauce without any lumps.
• Whole Milk (3 cups): For the creamiest, most decadent sauce, whole milk is non-negotiable. It provides the perfect fat content for a silky texture.
• Heavy Cream (1 cup): This is the secret to an ultra-rich and velvety sauce that feels truly indulgent.
• Fresh Spinach (10 oz / 280g): Roughly chopped. Fresh spinach wilts down beautifully, adding vibrant color, nutrients, and an earthy flavor that cuts through the richness.
• Grated Parmesan Cheese (3/4 cup, divided): Use freshly grated Parmesan for the best flavor and melting quality. Half will go into the sauce for a nutty, salty kick, and the other half will go on top for a golden crust.
• Shredded Mozzarella Cheese (2 cups, divided): A low-moisture, whole-milk mozzarella is perfect. It provides that classic, glorious cheese pull and a mild, creamy flavor.
• Salt (1 1/2 teaspoons, or to taste): Essential for bringing all the flavors to life.
• Black Pepper (1 teaspoon, freshly ground): Freshly ground pepper offers a pungent spice that balances the creaminess.
• Nutmeg (1/4 teaspoon, freshly grated): A classic addition to cream sauces, a tiny pinch of nutmeg enhances the dairy flavors and adds a warm, professional touch.

Preparación

1. 1

   Preheat and Prepare: Begin by preheating your oven to 375°F (190°C). Lightly grease a 9×13 inch (or a similar 3-quart) baking dish with butter or non-stick spray. This crucial step prevents the pasta from sticking and makes cleanup a breeze.

2. 2

   Cook the Pasta: Bring a large pot of heavily salted water to a rolling boil. Add the pasta and cook according to package directions, but be sure to undercook it by about 2 minutes, so it is very “al dente.” This is the most important step for avoiding a mushy final product. The pasta will continue to cook in the oven as it absorbs the sauce, so pulling it from the water early ensures it will have the perfect tender-chewy texture in the finished dish. Once cooked, drain the pasta well and set it aside.

3. 3

   Sauté the Aromatics: While the pasta is cooking, melt the 4 tablespoons of butter in a large, heavy-bottomed pot or Dutch oven over medium heat. Once the butter is melted and foamy, add the finely chopped onion. Sauté for 5-7 minutes, stirring occasionally, until the onion becomes soft, translucent, and fragrant. Add the minced garlic and cook for another minute until you can smell its potent aroma. Be careful not to let the garlic brown, as it can become bitter.

4. 4

   Create the Roux: Sprinkle the ¼ cup of all-purpose flour over the cooked onions and garlic. Whisk continuously for about 1-2 minutes. This process cooks out the raw flour taste and creates a “roux,” which is the essential thickening base for your cream sauce. The mixture should look like a thick, bubbly paste.

5. 5

   Build the Cream Sauce: Slowly begin to pour in the 3 cups of whole milk, about half a cup at a time, while whisking constantly. It’s important to add the milk gradually and keep whisking to prevent any lumps from forming. Once all the milk is incorporated, continue to cook the sauce, stirring frequently, for about 5-8 minutes, until it has thickened enough to coat the back of a spoon.

6. 6

   Enrich the Sauce: Reduce the heat to low. Pour in the 1 cup of heavy cream and stir to combine. This will make the sauce exceptionally rich and velvety. Now, stir in half of the shredded mozzarella (1 cup) and half of the grated Parmesan cheese (about ⅓ cup). Continue to stir gently until the cheeses are completely melted and the sauce is smooth and luxurious.

7. 7

   Add the Final Flavors: Season the sauce with the salt, freshly ground black pepper, and the pinch of freshly grated nutmeg. Stir well and give it a taste, adjusting the seasoning if necessary. Now, add the 10 ounces of fresh, chopped spinach. Stir it into the hot sauce; it will seem like a lot at first, but it will wilt down significantly within a couple of minutes.

8. 8

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9. 9

   Combine and Assemble: Add the drained, al dente pasta directly to the pot with the creamy spinach sauce. Stir gently but thoroughly, ensuring every piece of pasta is generously coated in the sauce.

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11. 11

    Prepare for Baking: Pour the pasta and sauce mixture into your prepared 9×13 inch baking dish and spread it into an even layer. Sprinkle the remaining 1 cup of mozzarella cheese and the remaining Parmesan cheese evenly over the top.

12. 12

    Bake to Perfection: Place the baking dish in the preheated oven. Bake, uncovered, for 20-25 minutes. The bake is ready when the sauce is bubbling vigorously around the edges and the cheesy topping is melted, golden brown, and slightly crispy in spots. For an extra-browned crust, you can switch the oven to the broil setting for the last 1-2 minutes, but watch it very closely to prevent burning.

13. 13

    Rest and Serve: Remove the pasta bake from the oven and let it rest on a wire rack for at least 10-15 minutes before serving. This resting period is vital; it allows the sauce to set up slightly, making it easier to serve and ensuring it holds its creamy consistency instead of running all over the plate. Garnish with fresh parsley if desired, and serve warm.