Taco Chicken Alfredo

Name: Taco Chicken Alfredo
Ingredients: 4 boneless, skinless chicken breast cutlets ( 1 to 1 1/4 pounds ); 1 ( 1 - ounce ) envelope taco seasoning mix (3 tablespoons), divided; 1 3/4 teaspoons kosher salt , divided; 3 tablespoons olive oil , divided; 1 small white onion , chopped; 1 large garlic clove , minced; 8 ounces dried penne pasta (2 1/4 cups); 1 ( 10 - ounce ) can mild diced tomatoes and green chilies , undrained (such as RO*TEL); 2 cups heavy whipping cream; 2 cups water; 1 ( 8 - ounce ) package shredded Mexican-style cheese blend (2 cups); 1 tablespoon chopped fresh cilantro , plus more for garnish; Pico de gallo , for serving, optional