Decrease oven heat to 350 degrees.
Combine the cream cheese, powdered sugar, Worcestershire sauce, lemon juice, garlic powder and sour cream and whip together with a hand or stand mixer until smooth.
Add the crab and green onions and fold evenly into the cream cheese mixture.
Spread dip into a flat baking dish sprayed with cooking spray.
Bake for 30 minutes.
Serve dip warm with the homemade wonton chips or store-bought pita or tortilla chips.