Mexican Stuffed Shells

INGREDIENTS

• 1 cup taco sauce (NOT enchilada sauce)
• 1 lb ground beef
• 1 (1 1/4 ounce) package taco seasoning (can use low-sodium)
• 1 (4 ounce) package cream cheese
• 14 -16 large pasta shells
• 1 cup salsa
• 1 cup cheddar cheese, shredded
• 1 cup monterey jack cheese, shredded
• 1 1/2 cups tortilla chips, crushed (optional)
• 3 green onions, chopped
• 1 cup sour cream