Preheat oven to 375°F (190°C) and grease a 9x13-inch baking dish.
In a large bowl, mix cream cheese, sour cream, soy sauce, garlic powder, and shredded cheese until smooth.
Fold in crab and green onions gently until evenly combined.
Spread mixture into the prepared baking dish and top with more shredded cheese if desired.
Add crispy topping: arrange wonton strips on top and spray with oil.
Bake uncovered for 25–30 minutes, or until bubbly and golden brown.
Let rest for 5 minutes before serving.