French Onion Mac and Cheese

Name: French Onion Mac and Cheese
Ingredients: 1 12oz. box of gluten-free pasta, cooked according to box instructions; 8 tablespoons unsalted butter; 3 medium-sized yellow onions; 1/2 teaspoon pepper; 1/2 teaspoon salt; 2 tablespoons vegetable broth; 1 1/2 teaspoons Worcestershire sauce; 3 tablespoons unsalted butter; 2 tablespoons gluten-free all-purpose flour; 2 cups whole milk, lukewarm; 1 teaspoon of dried thyme; 1 teaspoon of garlic powder; 1/2 teaspoon smoked paprika; 2 cups smoked gruyere cheese, grated; 1 cup mozzarella cheese, grated; 1 cup parmesan cheese, grated; 2 teaspoons dijon mustard; 3 pieces of gluten-free bread; 3 teaspoons dried thyme; 2 teaspoons garlic powder; Fresh parsley for garnish