Ham and Cheese Ziti

2 1/2 cups uncooked ziti pasta (9 ounces)
1/4 cup butter or margarine
1 garlic clove, finely chopped
1/4 cup all-purpose flour
1/2 teaspoon salt
2 cups milk
1/2 teaspoon Dijon mustard
2 cups shredded Colby cheese (8 ounces)
4 ounces sliced cooked deli ham, cut into thin strips
1/3 cup grated Parmesan cheese

1. Heat oven to 350ºF. Cook and drain pasta as directed on package.
2. While pasta is cooking, melt butter in 3-quart saucepan over low heat. Cook garlic in butter 30 seconds, stirring frequently. Stir in flour and salt. Cook over medium heat, stirring constantly, until mixture is smooth and bubbly. Gradually stir in milk. Heat to boiling, stirring constantly. Boil and stir 1 minute. Stir in mustard and Colby cheese. Cook, stirring occasionally, until cheese is melted.
3. Stir pasta and ham into cheese sauce. Pour into ungreased 2-quart casserole. Sprinkle with Parmesan cheese. Bake uncovered 20 to 25 minutes or until bubbly.