Preheat oven to 350°.
Sprinkle steaks with salt and pepper.
Melt 2 Tablespoons of butter in an oven proof skillet. Add steaks and sear on each side about 2 minutes or until well browned.
Place steaks in a 350° oven and using a meat thermometer, cook to preferred level of doneness. (these steaks are superb at medium rare.) Cover with foil and let them rest while preparing the sauce.
Melt the remaining 2 Tablespoons of butter in a skillet.
Add garlic and flour to pan stirring constantly for 1 minute.
Gradually add beef broth, wine, and bourbon, whisking to a boil. Reduce heat and whisk for 5 minutes or until thickened. Serve sauce over steaks.