1. Preheat oven to 425 degrees Fahrenheit (220 degrees Celsius).
2. Arrange the onion slices on a baking sheet lined with Gefen Parchment Paper. Add the crushed garlic and lay the chicken pieces on top. Smear a little bit of tomato paste over each piece of chicken. Season generously with salt and pepper.
3. Pour wine around the pan, then place mushroom slices around the chicken. Drizzle with olive oil and sprinkle with thyme. Bake for one hour.