Preheat oven to 350 degrees F. Cut each tortilla into 10 wedges. Spread wedges evenly on sheet pans and bake until nicely crisped, about 5-8 minutes. Set aside. Arrange chips on an ovenproof platter. Top the chips with black beans and jack cheese and place in the oven until cheese is completely melted, approximately 8 minutes.
Remove chips from oven and top with taco seasoning, tomatoes, green onion, guacamole and Greek yogurt or light sour cream.
Squeeze a wedge of lime over top and garnish with a sprig of cilantro.
Place all ingredients for guacamole in a food processor. Process on high until smooth. Season with salt.