In a shallow bowl, mix flour and garlic powder. Cut chicken into 1-1/2-in. pieces; pound each with a meat mallet to 1/4-in. thickness. Sprinkle with 1/2 teaspoon salt and pepper. Dip both sides of chicken in flour mixture to coat lightly; shake off excess., In a large skillet, heat oil over medium heat. Add chicken; cook 3-4 minutes on each side or until golden brown and chicken is no longer pink. Remove from pan; keep warm. Wipe skillet clean., In same pan, bring broth to a boil; stir in orzo. Return to a boil. Reduce heat; simmer, covered, 8-10 minutes or until tender. Stir in spinach, tomatoes, lemon juice, basil and remaining salt; remove from heat. Return chicken to pan. If desired, serve with lemon wedges.