OG Alfredo Sauce

Name: OG Alfredo Sauce
Cuisine: European, Italian, Mediterranean
Ingredients: 6 Tablespoons salted butter, high quality 1 Tablespoon garlic, minced 2 Tablespoons all-purpose flour 1 ½ cups heavy cream 1 ½ cups whole milk, 1% or 2% can be used if needed ½ cup Parmesan cheese, grated and at room temperature ½ cup Romano cheese, grated and at room temperature Salt and black pepper, to taste 1 lb. Fettuccine Parsley, to garnish; 1 Tablespoon garlic, minced; 2 Tablespoons all-purpose flour; Parsley, to garnish