1. Line a wire-mesh strainer with 3 layers of cheesecloth or 1 coffee filter. Place strainer over a bowl. Spoon yogurt into strainer. Cover and chill at least 4 hours or up to 12 hours. Remove yogurt, discarding strained liquid.
2. Combine strained yogurt, green onions, and next 6 ingredients.
3. Prepare chicken according to package directions. Serve with yogurt dip, pita chips, and assorted vegetables.