Slice eggs in half lengthwise; carefully remove yolks, keeping egg white halves intact.
Mash together yolks and avocado in a medium bowl. Stir in green onions and next 3 ingredients until smooth. Spoon yolk mixture evenly into egg white halves. Sprinkle evenly with chili powder, if desired. Cover and chill at least 1 hour or up to 24 hours. Dollop with salsa just before serving.