01 - In a shallow dish, combine the flour, salt, black pepper, and paprika. Mix thoroughly until evenly incorporated. Reserve 2 tablespoons of the seasoned flour mixture for the gravy and set aside.
02 - Pat the cube steaks dry with paper towels. Dredge each steak through the seasoned flour, pressing gently to coat both sides evenly. Shake off any excess flour and transfer to a clean surface.
03 - Heat the vegetable oil and 1 tablespoon of butter in a large skillet over medium-high heat until the butter is foaming. Carefully add the cube steaks and sear for 2 to 3 minutes per side until a deep golden crust forms. Transfer the browned steaks to a plate and set aside.
04 - Reduce the heat to medium. Add the remaining tablespoon of butter to the skillet along with the sliced onions and mushrooms. Cook, stirring occasionally, for 6 to 8 minutes until the onions are softened and the mushrooms are deeply caramelized.
05 - 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.
06 - Slowly pour in the beef broth and Worcestershire sauce, stirring constantly while scraping up any browned bits from the bottom of the skillet. Stir in the milk and bring the mixture to a gentle simmer.
07 - Return the seared cube steaks to the skillet, nestling them down into the gravy. Cover with a lid, reduce the heat to low, and simmer for 20 minutes until the steaks are fork-tender and the gravy has thickened to a silky consistency.
08 - Taste the gravy and adjust the seasoning with salt and pepper as needed. Transfer the steaks to serving plates, spoon the generous onion-mushroom gravy over the top, and garnish with freshly chopped parsley. Serve immediately alongside mashed potatoes, rice, or egg noodles.