Season chicken breasts with garlic powder, Italian seasoning, salt, and pepper. Set aside.
Heat olive oil in a large oven-safe skillet over medium-high heat. Sear chicken for 4-5 minutes on each side until golden brown. Remove and set aside.
In the same skillet, sauté spinach and sun-dried tomatoes for 2-3 minutes until spinach wilts.
Lower heat, add heavy cream, stir, then add Parmesan cheese and red pepper flakes. Stir until cheese melts and sauce thickens.
Return chicken to skillet, spoon sauce over it, and bake in preheated oven for 20-25 minutes until chicken reaches 165°F.
Let chicken rest for a few minutes, garnish with fresh basil, and serve hot.