In a small bowl, combine the refried beans, taco seasoning, and water. Stir until well combined and smooth. Spread this mixture evenly into the bottom of a shallow serving dish or pie plate.

In another bowl, mash the avocados with lime juice and salt until smooth. Carefully spread this avocado layer over the refried bean layer.

In a third bowl, combine the sour cream and garlic powder. Stir until well blended. Dollop and gently spread this sour cream mixture over the avocado layer, trying not to disturb the avocado too much.

Spoon the salsa evenly over the sour cream layer.

Sprinkle the shredded cheddar cheese over the salsa layer. Top with diced tomatoes, sliced black olives, and chopped cilantro, if using.

Refrigerate for at least 30 minutes to allow the flavors to meld before serving. Serve with tortilla chips.