Preheat your oven to 375°F (190°C).
In a skillet, heat olive oil over medium heat.
Season the chicken breasts with salt, pepper, garlic powder, and onion powder.
Brown the chicken breasts on both sides in the skillet for about 5 minutes.
In a bowl, mix the softened cream cheese with chicken broth until smooth.
Add dried thyme and stir until combined.
Pour the cream cheese mixture over the browned chicken in the skillet.
If using, add spinach on top of the chicken.
Cover the skillet and transfer it to the oven.
Bake for 20 minutes or until the chicken is cooked through and the sauce is bubbly.