Chicken Fajita Kebabs

Name: Chicken Fajita Kebabs
Ingredients: 6 skinless chicken thighs (chopped into pieces); 3/4 teaspoon chili powder; 3/4 teaspoon cayenne powder; 1/2 teaspoon ground cumin seed; 1/2 teaspoon smoked paprika; 1/4 cup apple cider vinegar; 1/4 cup lime juice; 1 teaspoon Sukrin Gold (or 5 drops SweetLeaf stevia clear); 2 cloves garlic (chopped); 1 medium green bell pepper (cut into 1-inch pieces); 1 medium red bell pepper (cut into 1-inch pieces); 1 jalapeño or green chili; 1/2 cup celery leaves; 2 tablespoons to 3 water; salt & pepper (to taste); 1 medium red onion (optional)