In a small bowl, combine yogurt, lemon juice, olive oil, chili powder, paprika, sea salt, cayenne pepper, garlic powder, ginger, cardamom and cinnamon.
Whisk to combine.
Spoon/pour mixture into a resealable plastic bag.
Add chicken; seal bag and turn several times to coat.
Refrigerate chicken overnight.
Coat grill rack with cooking spray before starting grill.
Remove chicken from resealable bag and discard marinade.
Grill chicken, covered, over medium heat for about 15 minutes; turn chicken thighs over and grill remaining side 10-15 minutes longer, or until juices run clear.
Internal temperature should reach 165 degrees.