6 skinless, boneless chicken breast halves - cut into cubes 6 tablespoons butter, divided
4 cloves garlic, minced, divided 1 tablespoon Italian seasoning 1 pound fettuccini pasta
1 onion, diced
1 (8 ounce) package sliced mushrooms
1/3 cup all-purpose flour 1 tablespoon salt
3/4 teaspoon ground white pepper
3 cups milk
1 cup half-and-half
3/4 cup grated Parmesan cheese 8 ounces shredded Colby- Monterey Jack cheese
3 roma (plum) tomatoes, diced 1/2 cup sour cream
