Pat the chicken breasts dry with paper towels. If they are very thick, pound them to an even thickness.
Season both sides with garlic powder, onion powder, Italian seasoning, paprika, salt, and black pepper.
Heat the olive oil in a large skillet over medium-high heat.
Cook the chicken for 5 to 6 minutes per side until golden brown. Remove from the skillet and set aside.
Reduce the heat to medium. Add the butter and minced garlic, then cook for 30 seconds until fragrant.
Pour in the chicken broth and scrape up any browned bits from the bottom of the skillet.
Stir in the heavy cream and Parmesan cheese. Simmer for 2 to 3 minutes, stirring until the cheese melts and the sauce begins to thicken.
Add the sun-dried tomatoes and spinach. Cook for 2 minutes until the spinach wilts.
Stir in the lemon juice.
Return the chicken breasts to the skillet and spoon the creamy Tuscan sauce over the top.
Simmer for 3 to 5 minutes, or until the chicken reaches an internal temperature of 165°F (74°C).
Garnish with fresh basil or parsley and serve immediately.