Tandoori Chicken Kebabs

Name: Tandoori Chicken Kebabs
Ingredients: 1 cup low-fat plain yogurt; Zest of 1 lemon; 1 tablespoon lemon juice; 1 ½ tablespoons tandoori spice blend or hot curry powder; 2 cloves garlic, minced; 2 tablespoons extra-virgin olive oil, divided; ¾ teaspoon salt, divided; ½ teaspoon ground pepper, divided; 1 pound boneless, skinless chicken thighs, trimmed, cut into 1-inch pieces; 1 large bell pepper, cut into 1-inch pieces; 1 medium red onion, cut into 1-inch pieces