Special equipment: small wooden skewers or large toothpicks
Preheat the oven to 400 degrees F. Set a wire rack over a baking sheet.
Melt the butter with the chili powder in a small pan, stirring to combine. Divide the chili butter between 2 separate bowls.
Wrap each shrimp in a half piece of bacon and skewer with a small skewer or large toothpick. Arrange the shrimp on the wire rack and brush with half of the chili butter (1 of the bowls).
Bake until the bacon is cooked, 5 to 10 minutes. With a clean brush, brush on more chili butter from the second bowl. Serve on a big platter and sprinkle with sliced green onions.
These can be taken out of the oven up to 1 hour before serving and kept warm. Brush on the second portion of chili butter right before serving.