In a medium bowl, combine the two 16-oz cans of refried beans with 1½ tablespoon of taco seasoning. Mix until well combined, then use a spatula to spread the bean mixture evenly into the bottom of a 9×13 casserole dish.
Now spread 2 cups of guacamole evenly on top of the refried beans layer.
In a separate medium bowl, mix together 2 cups of sour cream with the remaining 1 tablespoon taco seasoning. Spread the sour cream over the guacamole layer.
Now drain a 21 oz jar of chunky salsa through a fine mesh strainer to remove as much liquid as possible. Once drained, spread the salsa evenly over the sour cream layer.
Sprinkle 2 cups of shredded cheddar cheese on top of the salsa layer, covering it evenly.
Top with 4 chopped Roma tomatoes (seeds removed and drained from excess liquid).
Now Sprinkle on ½ cup of sliced black olives, and ½ cup of chopped green onions. Cover the casserole dish tightly with plastic wrap and refrigerate for at least 1 hour to let the flavors meld. Serve with tortilla chips and enjoy!