Pat the chicken dry with a paper towel. Season both sides of the chicken with the kosher salt, black pepper and garlic powder.
In a large skillet, heat the olive oil over medium-heat. Add the chicken and cook until browned on both sides and the internal temperature is 165℉, or the center is no longer pink, 3 to 5 minutes per side. Transfer to a plate and set aside.
In the same pan over medium-low heat, melt the butter. Add the garlic, oregano and thyme and cook until the garlic is lightly browned and fragrant, 30 seconds to 1 minute. Add the capers and cream and simmer for 2 minutes, stirring occasionally and scraping the brown bits off the bottom of the pan. Add the spinach and cook until wilted, about 1 minute, then return the chicken to the pan and warm it for 2 minutes, spooning some of the sauce over the chicken.
Squeeze the lemon wedges onto the chicken and add them to the pan. Top with a sprinkle of Parmesan cheese. Serve warm, with a spoonful of sauce.