Heat 2 teaspoons oil in a large nonstick skillet over medium-high heat.
Combine 1/2 teaspoon cumin, 1/2 teaspoon coriander, salt, black pepper, and red pepper; sprinkle mixture evenly over chicken.
Add chicken to pan; cook 7 minutes on each side or until done.
While chicken cooks, heat the remaining 1 teaspoon oil in a small skillet over medium-high heat.
Add onion to pan; saut 1 minute.
Add garlic to pan; saut 30 seconds.
Transfer onion mixture to a large bowl; add remaining 1/2 teaspoon cumin, remaining 1/4 teaspoon coriander, tomato, and remaining ingredients to onion mixture, tossing well.