Mexican Stuffed Shells

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 taco sauce (NOT enchilada sauce)
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
Directions:

1 Preheat oven to 350°.
2 In a frying pan cook ground beef; add taco seasoning and prepare according to package directions. Add cream cheese, cover and simmer until cheese is melted. Blend well. Set aside and cool completely.
3 While the ground beef is cooking, cook the pasta shells according to directions; drain. Set shells out individually on baking sheet so that they don’t stick together.
4 Pour salsa on bottom of a 9×13 inch baking dish. Stuff each shell with the meat mixture placing shells in dish open side up. Cover shells with taco sauce. Cover with foil and bake for 30 minutes.
5 After 30 minutes, add shredded cheese and bake for 10-15 more minutes, with the foil removed. Top with green onions and serve with sour cream and/or more salsa.

Source : food.com