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Ingredients:
8 ounces elbow macaroni or your favorite pasta shape
2 tablespoons unsalted butter
2 large onions, thinly sliced
2 cloves garlic, minced
2 tablespoons all-purpose flour
2 cups beef broth
1 cup shredded Gruyere cheese
1 cup shredded Swiss cheese
1 cup shredded mozzarella cheese
Salt and black pepper to taste
1/4 cup grated Parmesan cheese
Chopped fresh parsley for garnish (optional)