Place onion, green onions, poblano pepper, garlic cloves and spices in a blender or food processor until a paste forms.
Keep the blender on low and slowly stream in coconut aminos and oil.
Place chicken thighs in a glass baking pan, pour marinade all over thighs and turn to coat.
Cover glass baking pan with plastic wrap and place in refrigerator to marinate for at least 1 hour or overnight.
Remove chicken from refrigerator.
Prepare and light the grill.
Grill the chicken, turning occasionally, until browned and cooked through (a meat thermometer inserted in the thickest part of the meat should read 165 degrees F), about 30 minutes.
Transfer chicken to a platter and serve (serving suggestion: I like to serve this alongside steamed jasmine rice and fresh or grilled pineapple).