At least two hours before serving, make the marinade by combining 1/2 teaspoon garlic powder, 1 tablespoon coriander, 1 tablespoon cardamom, 1 tablespoon cumin, 1 teaspoon cayenne, 2 teaspoons smoked paprika, 2 tablespoons lemon juice, 1 tablespoon sea salt, 3 tablespoons olive oil in a nonreactive bowl. Reserve 1 1/2 tablespoons and set it aside. Add 3/4 pound boneless, skinless chicken breasts making sure it is heavily covered in the marinade, cover and place in the refrigerator for at least two hours up to overnight.
Cook the rice according to the instructions on the package.
Heat a grill at medium to high heat. While the grill is heating, mix 1/2 cup Greek yogurt, 1 clove garlic minced, 1 teaspoon 1 teaspoon ground cumin, and 1 tablespoon lemon juice together in a small bowl and set aside.
Place the marinated chicken on the hot grill; cook for approximately 8 minutes or until the chicken no longer sticks to the grates. Flip the chicken over and cook for 6 to 8 minutes longer or until the chicken reaches an internal temperature of 165 degrees f.
While the chicken is cooking, add 1 tablespoon olive oil to a heavy skillet and heat it over medium-high heat. Once the skillet and oil are hot, add 1 bell pepper, chopped, 1 zucchini, sliced and 1/2 onion sliced. Cook for a few minutes until they are tender.
Assemble the bowls - divide the rice, veggies and chicken in half and pile it into two bowls and enjoy!