Homemade Baked Mac and Cheese Recipe

Ingredients
4 cups uncooked elbow macaroni
3/4 cup finely chopped onion
3/4 cup butter, divided
6 tablespoons all-purpose flour
4-1/2 cups milk
4 cups (16 ounces) shredded sharp cheddar cheese
1 teaspoon ground mustard
1-1/2 teaspoons salt
1/4 teaspoon pepper
3/4 cup dry bread crumbs

Directions
Cook macaroni according to package directions. Meanwhile, in a saucepan, saute the onion in 1/2 cup butter. Add the flour; whisk until blended. Gradually add milk. Bring to a boil; cook and stir until thickened. Stir in the cheese, mustard, salt and pepper until smooth. (Stir constantly or it will stick to the bottom of the pan).
Drain macaroni and add to sauce; stir until coated. Transfer to a greased 13-in. x 9-in. baking dish. Melt the remaining butter; toss with bread crumbs. Sprinkle over macaroni mixture. Bake, uncovered, at 350° for 30-35 minutes or until heated through. Yield: 6-8 servings.