Preheat your oven to 375 degrees f.
Cut chicken in half lengthwise to create 4 thinner chicken breasts. Pat your chicken dry using paper towels.
Rub the chicken breasts on all sides with the thyme, sea salt and pepper.
Heat the oil in a large oven-safe skillet over medium-high heat.
Sear the chicken until golden brown on each side, about 2-3 minutes per side, then set it aside on a plate.
In your same preheated skillet, add the onion and sauté for 3-4 minutes. Stir in the garlic and tomatoes then sauté for a couple of minutes, until the tomatoes start to burst.
Pour in the wine or broth and allow it to bubble for a few minutes.
Return your chicken into the skillet and nestle it into the sauce and top with crumbled feta cheese.
Transfer your skillet to the preheated oven and bake for 10-15 minutes or just until the chicken reaches an internal temperature of 165° F.
Garnish with freshly chopped parsley.