Cut the chicken breast in half lengthwise and beat the thickest part so they are even in thickness.
Combine ¾ tsp Italian seasoning, 1 tsp salt, and ¼ tsp pepper and season the chicken on both sides.
In a shallow dish, add the flour for dredging. Coat the chicken in the flour, shaking off any excess flour.
Add oil and 1 Tbsp butter to a large skillet over high heat. Once hot, add the chicken and cook for 3-4 minutes per side or until the thickest part of the chicken reaches 155°F.
Remove the chicken from the skillet and cover to keep warm. The chicken will reach a temperature of 165°F by finishing cooking in the residual heat.
In the same skillet, add the remaining 1 Tbsp butter, the garlic, and sun-dried tomatoes and cook for 1 minute. With a wooden spoon, scrape off the browned bits at the bottom of the pan.
Stir in the heavy cream, chicken broth, parmesan cheese, and remaining italian seasoning, salt, and pepper. Turn the heat to low and cook until the sauce starts to thicken.
Add the spinach and chicken into the sauce and cook until the spinach is wilted and the chicken is reheated.
Serve and enjoy, friends.