In A Large Bowl, Combine The Cream Cheese, Cheddar Cheese, Taco Seasoning And 2/3 Cup Onions. Shape Into A Cauldron; Wrap In Plastic Wrap. Refrigerate Until Serving. Just Before Serving, Cut Face Shapes Out Of American Cheese As Desired; Press Onto Cauldron. Press Crushed Chips Onto Cauldron To Coat. Place Remaining Onions On Top. Garnish With Pepper Strips, Carrot Sticks And Pretzels. Serve With Additional Tortilla Chips.