Preheat your oven to 400°F.
Pat the chicken dry and season both sides with Italian seasoning, salt, and black pepper.
Heat 1 tablespoon of olive oil in a skillet over medium-high heat and sear the chicken for 2 to 3 minutes per side until golden.
Arrange the seared chicken in a baking dish.
Scatter the grape tomatoes and minced garlic around, and place the block of feta in the center of the dish.
Drizzle the remaining olive oil and the lemon juice over the dish.
Bake for 15 to 25 minutes until the chicken reaches an internal temperature of 165°F.
After cooking, remove the chicken and mash the feta and tomatoes.
Add the dried thyme, dried basil, and onion powder.
Stir in the heavy cream.
Return the chicken to the pan, spoon some of sauce over each breast, and garnish with fresh basil before serving.