Preheat your oven to 375°F (190°C).
Season the chicken thighs with salt and pepper.
Heat the olive oil in a large oven-proof skillet over medium-high heat.
Add the chicken thighs skin-side down and sear until the skin is golden and crispy, about 5-7 minutes.
Flip the chicken and cook for an additional 3 minutes. Remove the chicken from the skillet and set aside.
In the same skillet, add the sliced onion and minced garlic, sautéing until the onion is translucent and the garlic is fragrant, approximately 3 minutes.
Stir in the tomato paste, thyme, and rosemary, cooking for another 1 minute.
Deglaze the skillet with white wine, scraping up any browned bits from the bottom of the pan.
Add the chicken stock, lemon slices, and olives to the skillet, bringing the mixture to a simmer.
Return the chicken thighs to the skillet, nestling them into the sauce.
Transfer the skillet to the preheated oven and roast for 30 minutes, or until the chicken is fully cooked and reaches an internal temperature of 165°F (74°C).
Remove from the oven and let it rest for a few minutes before serving.