In a small bowl, whisk together sour cream and taco seasoning until thoroughly combined. Set aside.
Spread the refried beans out in an even layer in the bottom of a 9×13-inch baking dish. Layer the guacamole in an even layer on top of the beans, followed by a layer of the sour cream mixture, then the cheese, tomatoes, olives, red onion, and green onions. Then sprinkle the cilantro evenly on top of the green onions.
Serve immediately with chips for dipping. Or cover with plastic wrap and refrigerate for up to 6 hours.