Season the steaks with the black pepper and thyme.
Spray a 10-inch nonstick skillet with the cooking spray and heat over medium-high heat for 1 minute. Add the steaks and onion and cook the steaks about 10 minutes for rare or to desired doneness. Remove the steaks and onion from the skillet and keep warm.
Add the stock, wine and cherries to the skillet. Reduce the heat to medium. Cook for 10 minutes or until the sauce is reduced to about 1 1/2 cups. Stir in the butter. Serve the sauce with the steaks. Sprinkle with the cheese.