01 - In a shallow dish, combine the flour, salt, black pepper, and paprika. Mix thoroughly and set aside 2 tablespoons of the seasoned flour for the gravy. Dredge each cube steak in the remaining flour, coating both sides evenly, and shake off any excess.
02 - Set a large skillet over medium-high heat and add the vegetable oil along with 1 tablespoon of butter. Once the fat is hot and shimmering, carefully lay the dredged cube steaks in the pan. Sear for 2 to 3 minutes per side until a deep golden crust forms. Transfer the steaks to a plate and tent loosely with foil.
03 - Reduce the heat to medium and add the remaining tablespoon of butter to the same skillet. Toss in the sliced onions and mushrooms, stirring occasionally. Cook for 6 to 8 minutes until the onions are translucent and the mushrooms have released their moisture and turned golden brown.
04 - Add the minced garlic and the reserved seasoned flour to the skillet. Stir continuously for about 1 minute to cook off the raw flour taste and bloom the garlic.
05 - Slowly pour in the beef broth and Worcestershire sauce while scraping up any browned bits from the bottom of the pan. Stir in the milk and bring the mixture to a gentle simmer, allowing it to slightly thicken.
06 - Nestle the seared cube steaks back into the skillet, spooning some of the gravy over the top. Cover with a tight-fitting lid, reduce the heat to low, and let them braise for 20 minutes until fork-tender and the gravy has reached a rich, coats-the-back-of-a-spoon consistency.
07 - Taste the gravy and adjust the salt and pepper as needed. Plate each steak with a generous ladle of onion-mushroom gravy and finish with a sprinkle of fresh parsley.