01 - In a shallow dish, whisk together the flour, salt, black pepper, and paprika until evenly combined. Reserve 2 tablespoons of the seasoned flour and set aside for the gravy.
02 - Working one at a time, press each cube steak into the seasoned flour, coating both sides thoroughly. Shake off any excess and transfer to a clean surface.
03 - 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 steaks in the pan. Sear for 2 to 3 minutes per side until a deep golden crust forms. Transfer the browned steaks to a plate and tent loosely with foil.
04 - Reduce the heat to medium and add the remaining tablespoon of butter to the skillet. Drop in the sliced onions and mushrooms, stirring occasionally, until the onions have softened and the mushrooms are deeply caramelized, about 6 to 8 minutes.
05 - Add the minced garlic and the reserved seasoned flour to the skillet. Stir continuously for about 1 minute, allowing the raw flour taste to cook off and the garlic to become fragrant.
06 - Slowly pour in the beef broth and Worcestershire sauce, whisking constantly and scraping up every browned bit from the bottom of the pan. Stream in the whole milk and bring the mixture to a gentle simmer, stirring until smooth.
07 - Nestle the seared cube steaks back into the gravy, spooning some of the liquid over the top. Cover the skillet with a tight-fitting lid, reduce the heat to low, and let everything simmer for 20 minutes until the meat is fork-tender and the gravy has thickened to a silky consistency.
08 - Taste the gravy and adjust the seasoning with additional salt and pepper as needed. Transfer the steaks to serving plates, spoon generous amounts of gravy over each portion, and garnish with freshly chopped parsley. Serve immediately alongside mashed potatoes, steamed rice, or buttered egg noodles.