Heat water for cooking orzo in a medium sized saucepan, and cook orzo according to package directions
Heat a medium sized saute pan on medium-high heat
Add oil to pan and wait for it to get warm, put garlic and cook for about 30 seconds, stirring constantly
Add chicken and seasonings
Add in mushrooms and peppers
Cook until chicken is cooked through and veggies are tender
When chicken is finished, and orzo is done cooking and drained, add tomatoes and green onions to chicken mixture. Stir well and serve immediately. You can stir in orzo as well to coat it with pan juices.