In medium mixing bowl add soup and water and whisk to combine until smooth. Add rice, onion powder, pepper and mixed vegetables. Pour mixture into the bottom of the prepared baking dish.
1 can 10 ¾ oz. cream of chicken soup, 1 ⅓ cup water, ¾ cup uncooked white rice, ½ teaspoon onion powder, ¼ tsp pepper, 2 cups frozen mixed vegetables