Creating the wonderful flavors of Tuscan Lemon Chicken is a straightforward process. Follow these steps:

1. Prepare the Chicken: Place the chicken breasts between two sheets of plastic wrap and pound them to an even thickness for uniform cooking.
2. Make the Marinade: In a bowl, combine olive oil, lemon zest, lemon juice, minced garlic, dried oregano, salt, black pepper, and red pepper flakes if using.
3. Marinate: Add the chicken to the marinade, ensuring all pieces are well coated. Let it marinate for at least 20 minutes, or up to 2 hours for a deeper flavor.
4. Preheat the Oven: While the chicken marinates, preheat your oven to 400°F (200°C).
5. Sear the Chicken: In an oven-safe skillet, heat a drizzle of olive oil over medium-high heat. Remove chicken from marinade, allowing excess to drip off. Sear the chicken for 3-4 minutes on each side until golden brown.
6. Add Broth and Vegetables: Pour the chicken broth (or white wine) into the skillet, add halved cherry tomatoes, and fresh spinach around the chicken.
7. Bake: Transfer the skillet to the preheated oven and bake for 20-25 minutes or until the chicken is cooked through (internal temperature reaches 165°F or 75°C).
8. Rest the Chicken: Remove the skillet from the oven and let the chicken rest for 10 minutes. This will keep it juicy and flavorful.
9. Garnish and Serve: Sprinkle the dish with chopped fresh parsley before serving for an added burst of flavor.

Following these precise steps will ensure that your Tuscan Lemon Chicken turns out incredibly delicious every time.