Combine crushed corn chips and butter; press onto bottom and 1 inch up sides of a lightly greased 9-inch springform pan.
Bake at 350° for 10 minutes. Cool on a wire rack.
Combine refried beans and taco seasoning mix, stirring well; spread over prepared crust. Layer avocado dip and next 5 ingredients over refried bean mixture; cover and chill 8 hours.
Place on a serving plate, and remove sides of springform pan; garnish, if desired. Serve with large corn chips.