Pre-heat oven to 400°F. Grease 9-by-13-inch pan with cooking spray.
Mix cream cheese, green onions, and garlic powder in large bowl with hand-held blender.
In a separate bowl, beat egg and mix in water.
Place wonton wrapper on plate. Scoop 1 teaspoon cream cheese mixture in the middle. With a brush, wet edges of wrapper with egg wash. Using your fingers, pick up each edge of the wonton and pinch tightly at the top to form an x. Repeat with the rest of wrappers, placing them onto greased sheet.
Spray wontons lightly with cooking spray. Bake in oven for 10-15 minutes or until edges look light brown and crispy.