Ingredient:

• 1 ¼ pounds lean ground beef
• 1 (3 ounce) package cream cheese
• 1 teaspoon salt
• 1 teaspoon chili powder
• 18 jumbo pasta shells
• 2 tablespoons butter, melted
• 1 cup taco sauce
• 1 cup shredded Cheddar cheese
• 1 cup shredded Monterey Jack cheese
• 1 ½ cups crushed tortilla chips
• 1 cup sour cream