Black Bean Chicken Chili

In large skillet sprayed with nonstick cooking spray, brown over medium heat:
1 to ½ pounds chicken tenderloins, cut in ½ inch pieces
1 c. chopped onion
Stir in and bring to a boil:
1 can pinto, white, or small red beans, drained
1 can black beans, drained
1 can stewed tomatoes, Mexican style
2 T. chili powder or seasoning mix.
Simmer for 20 minutes. Serves 6