Start by seasoning both sides of the chicken breasts generously with salt, pepper, and Italian seasoning. Heat the olive oil in a large skillet over medium heat. Once hot, add the chicken breasts to the skillet. Cook for approximately 6 to 7 minutes on each side until they are fully cooked through, golden brown, and no longer pink in the center. Once done, remove the chicken from the skillet and transfer it to a plate, covering it to keep warm.
Using the same skillet (do not rinse it!), add the minced garlic. Sauté for about 1 minute or until it becomes fragrant, being careful not to burn it. Next, add the finely chopped spinach to the skillet, stirring frequently until it wilts, which should take about 2 to 3 minutes.
Reduce the heat to low and carefully pour in the heavy cream, stirring constantly to ensure it mixes well with the sautéed spinach and garlic. Gradually incorporate the grated Parmesan cheese into the mixture, stirring until smooth and creamy. Taste the sauce and adjust flavor with additional salt and freshly ground black pepper as desired.
Return the cooked chicken breasts to the skillet, ensuring they are well coated in the creamy spinach sauce. Allow everything to simmer gently together for about 2 to 3 minutes, so the chicken reabsorbs some flavors.
Using a spatula, transfer the Chicken Florentine to individual serving plates. Garnish the dish with halved cherry tomatoes and freshly torn basil leaves.
Notes
For a burst of color and flavor, garnish with cherry tomatoes and basil.