Preheat oven to 350 degrees F.
In a medium bowl, add chciekn thighs and Italian dressing. Allow chicken to sit for about 15-20 minutes.
While chicken is marinating, add oil to dutch oven and heat over MED-HIGH heat. Saute garlic, basil, sun dried tomatoes, and mushrooms until veggies are slightly tender. Add white cooking wine, 1 tbsp of Italian seasoning, and spinach and toss until combined. Season with salt and pepper to taste and transfer veggies to a plate.
Add chicken thighs, skin side down, and sear for 2-3 minutes per side, to develop a nice crispy skin.
Add veggies back to the dutch oven and sprinkle 1 tbsp of Italian seasoning on top. Sprinkle a little salt and pepper to taste, if desired. Bke for 30-35 minutes (covered).
Remove cover and bake another 15-20 minutes, until chicken is completely done and cooked throughout.
Garnish with additional basil and Enjoy!