Baked Homemade Mac and Cheese

Name: Baked Homemade Mac and Cheese
Ingredients: 1-¼ cup Dry Elbow Macaroni; 2 Tablespoons Butter Plus More For Topping If Desired; 2 Tablespoons All-purpose Flour; 1 can (12 Oz. Size) Evaporated Milk; 1 teaspoon Sea Salt; 2 teaspoons Fresh Ground Black Pepper; 1 Tablespoon Finely Minced Onion (optional); 1 teaspoon Onion Powder (optional, If Not Using Fresh Onions); 2 cloves Finely Minced Garlic (or Substitute Garlic Powder); 2 teaspoons Yellow Mustard (optional); 2 cups Sharp Cheddar Cheese; 2 Tablespoons Corn Flake Crumbs