COOK THE CHICKEN
In a bowl, add the chicken, olive oil, Italian seasoning, salt, garlic powder, oregano, black pepper, and red pepper flakes. Mix to marinade evenly.
Heat an oiled skillet or pan over medium-high heat.
Add the marinated chicken to the pan and cook on each side until golden brown, about 3 minutes each side. Then drop the heat to low and allow the chicken to cook through to the center or the temperature registers 165°F. Remove the chicken from the pan.
MAKE THE TUSCAN SAUCE
In the same saucepan over medium heat, add the lemon juice and butter. Scrape the bottom of the pan with a wooden spoon and add the garlic and tomatoes. If you'd like to add onions, feel free to do so at this step. Saute for a minute or two.
Add the heavy cream and chicken broth. Whisk together and bring to a simmer for 2 to 3 minutes.
Add the cream cheese and parmesan and whisk again until the sauce thickens. Once it thickens, add salt and black pepper to taste.
Mix in the basil, parsley, and spinach.
Add the chicken back into the pan with the sauce and enjoy!