Best-Ever French Onion Pasta Bake 🧅🍝✨

Step-by-Step Instructions:

Step 1: Caramelize the Onions

1. Heat butter and olive oil in a large skillet over medium-low heat.
2. Add the sliced onions and sprinkle with sugar, salt, and black pepper. Stir to coat the onions evenly.
3. Cook the onions, stirring occasionally, for 30-40 minutes until they are deeply caramelized and golden brown. If they start to stick, add a splash of water to deglaze the pan.
4. Stir in the thyme and white wine, if using, and cook until the liquid is mostly evaporated, about 2-3 minutes.
5. Pour in the beef or vegetable broth, simmer for 2-3 more minutes, and set aside.

Step 2: Cook the Pasta

1. Bring a large pot of salted water to a boil.
2. Cook the pasta until just al dente, about 1-2 minutes less than the package instructions. It will finish cooking in the oven.
3. Drain the pasta and set it aside.

Step 3: Make the Cheese Sauce

1. In a medium saucepan, melt butter over medium heat.
2. Whisk in the flour and cook for 1-2 minutes to form a roux.
3. Gradually whisk in the milk and heavy cream, stirring constantly to prevent lumps. Cook until slightly thickened, about 3-4 minutes.
4. Stir in garlic powder, onion powder, ½ cup of Gruyère, ½ cup of mozzarella, and ¼ cup of Parmesan. Mix until the cheese is melted and the sauce is smooth. Remove from heat.

Step 4: Assemble the Bake

1. Preheat your oven to 375°F (190°C).
2. In a large mixing bowl, combine the cooked pasta, caramelized onion mixture, and cheese sauce. Mix until the pasta is evenly coated.
3. Transfer the mixture to a greased 9×13-inch baking dish.
4. Top with the remaining Gruyère, mozzarella, and Parmesan cheese.

Step 5: Bake to Perfection

1. Bake uncovered in the preheated oven for 20-25 minutes, or until the cheese is melted and bubbling.
2. For an extra golden crust, turn on the broiler for the last 2-3 minutes. Watch carefully to avoid burning.

Step 6: Garnish and Serve

1. Remove the pasta bake from the oven and let it cool for 5 minutes.
2. Sprinkle with freshly chopped parsley, if desired, and serve hot.

Pro Tips:

• For a deeper flavor: Use homemade beef broth or a high-quality store-bought version.
• Make it vegetarian: Swap the beef broth for vegetable broth and use plant-based cream and cheeses.
• Storage: Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. Reheat in the oven or microwave.

This Best-Ever French Onion Pasta Bake is the ultimate marriage of rich flavors, gooey cheese, and comforting pasta. Perfect for sharing with loved ones or indulging solo with a glass of wine. Bon appétit!