Make Steak Tips Marinade - mix bourbon (or beef broth), olive oil, worcestershire sauce, fresh garlic, onion powder, and pepper into a gallon-size ziplock bag. Add steak tips, close the bag and shake gently. Marinate for 30 minutes in the refrigerator, then remove steak from bag and discard marinade. Marinate longer (up to 8 hours or overnight) for more intense flavor.
Add Beef to Hot Skillet - heat a large skillet over medium-high heat. Once the pan is hot, add the marinated steak tips and cook for 6-8 minutes until your desired doneness. (I recommend medium to medium rare which registers an internal temperature of 130º to 135ºF on a meat thermometer.) Transfer the beef tips to a plate, cover with foil and set aside.
Add Butter to Skillet - reduce the heat to medium. Add butter to skillet.
¼ cup salted butter
Make Brown Butter - cook butter on medium heat until it starts to turn golden brown, stirring constantly for about 5 minutes.
Add Beef Back to Skillet - toss the beef in the brown butter and sauté for 1 minute, spooning the butter over the meat.
Add Parsley - sprinkle beef tips with fresh parsley and serve hot from the skillet topped with brown butter.
1 Tablespoon fresh parsley
Notes
Tenderloin is an expensive cut of meat, but if you buy a 5 lb. whole tenderloin, you can make several different dinners. One whole tenderloin can yield 4 steaks, a small roast and enough tips to make steak bites.
Any heavy skillet will work, but a cast iron skillet will create the best sear.
Make sure to marinate the meat in the refrigerator and discard the marinade once it is used. You can marinate up to 8 hours for more intense flavor.
The salted butter should give these steak bites plenty of flavor, but if you need more, add salt and pepper to taste.
Put the tenderloin in the freezer for about 15 minutes before cutting it into tips. It's much easier to cut when it's cold!