Start by seasoning both sides of your chicken breasts with Italian seasoning, salt, and pepper. Heat 1 tablespoon of olive oil in your skillet over medium-high heat, then sear the chicken until golden brown on both sides. This locks in juices and builds flavor.
Next, add the grape tomatoes, pressed garlic, spinach, and block of feta on top of the chicken. Drizzle the remaining olive oil over everything. This combination will bake into a creamy, flavorful sauce.
Place the skillet in a preheated oven at 400°F (200°C) for 15-20 minutes, or until chicken reaches an internal temperature of 165°F (74°C). The feta and tomatoes will soften and meld together.
Remove the skillet from the oven and set the chicken aside. Use a spatula to mash the baked feta and tomatoes together into a creamy sauce. Stir in the heavy cream for extra richness.
Slice the chicken if desired and return it to the skillet, covering it with the sauce. Serve immediately with your choice of sides.