On medium high heat, pan sear 3 boneless, skinless chicken breasts seasoned with salt and pepper in 1 T olive oil for 7-9 minutes on each side until cooked through. Remove from pan and set aside.
In the same skillet, saute 1 small chopped onion & 1 clove minced garlic in a little more olive oil. When cooked through, add approx 3/4 lb baby kale (or regular kale, deveined). Stir then cover, stirring occasionally. When wilted, add 2 chopped tomatoes. Add chicken back to skillet. Cover and cook a few more minutes. Serve immediately.