Smoked Sausage Alfredo Bake

1 Pound dry pasta
3 Tablespoons butter
3 Garlic cloves, minced
3 Tablespoons flour
1 Cup chicken broth
2 Cups half & half
1/2 Teaspoon salt
1/4 Teaspoon pepper
1/4 Teaspoon cayenne pepper
1/2 Cup grated Parmesan cheese
2 Cups grated mozzarella cheese, divided
1-2 Tablespoons chopped fresh parsley
1 (12 oz) Package fully cooked smoked sausage, any variety

Cook pasta according to package directions until just al dente; drain.
While pasta cooks, melt butter in a large skillet over medium heat. Add garlic and cook until fragrant, 1-2 minutes. Stir in flour.
Whisk in chicken broth until smooth then stir in half & half.
Add salt, pepper, cayenne, and red pepper flakes and simmer until sauce is thickened, about 5 minutes.
Stir in Parmesan cheese and 1 cup of mozzarella until cheeses are melted and smooth.
Slice sausage into 1/4 inch pieces and add to the sauce, along with the chopped parsley and cooked pasta, season with additional salt and pepper if needed.
Preheat broiler. Pour the pasta mixture into a lightly greased, 9� x 13� baking dish. Top with remaining mozzarella cheese.
Place in preheated oven and broil for 2 - 3 minutes, or until cheese is bubbly and golden.