Preheat a large pan to medium-high heat with olive oil.
Add chicken breast pieces and brown on both sides, adding salt, pepper and paprika on both sides.
When both sides are browned, about 10 minutes, remove from pan and leave to side. The insides do not need to be fully cooked yet.
Bring down to low-medium heat. In the same pan, add another 1 tbsp olive oil. Add diced onion with minced garlic and cook for 1-2 minutes.
Stir in marinara sauce, capers and dried basil.
Add chicken to pan, cover in sauce and stir in kale. Cook covered for 6-8 more minutes or until chicken is no longer pink.