French Onion Pasta Bake - Home Recipe Guide

Ingredients

• 3 tablespoons unsalted butter
• 2 tablespoons olive oil
• 4 large yellow onions, thinly sliced
• 1 teaspoon salt
• ½ teaspoon sugar
• 3 garlic 3–4 cloves, minced
• 1 tablespoon fresh thyme leaves
• ¼ cup dry white wine
• 1 tablespoon all-purpose flour
• 2 teaspoons balsamic vinegar
• 1 cup beef broth
• 1 cup heavy cream
• ½ cup sour cream or crème fraîche
• Salt and pepper to taste
• 12 oz pasta
• 1 ½ cups shredded Gruyère cheese
• ½ cup grated Parmesan cheese
• Optional: ½ cup mozzarella for extra meltiness
• Fresh thyme or parsley for garnish