Wash and thoroughly pat dry the chicken pieces. Heat the olive oil in a large pan with a sprig of rosemary. Add the meat and brown it for 10 minutes over gentle heat, turning the chicken so that it cooks evenly on all sides. Deglaze with a glass of white wine and cook for an additional 5 minutes until the alcohol has completely evaporated.
Remove the chicken from the pan once it is well browned and set it aside.
Add the halved cherry tomatoes, thyme, sage, a pinch of salt, and minced garlic clove to the same pan.
Cook for 3 minutes until a light sauce forms.
Return the browned chicken to the pan along with the other ingredients. Cook for 15 minutes over low heat, then add the pitted olives and let the flavors meld for an additional 5 minutes, stirring occasionally.
Serve the chicken with olives garnished with a fresh basil leaf and enjoy.