01 - In a shallow dish, whisk together the flour, salt, black pepper, and paprika until evenly combined. Set aside 2 tablespoons of the seasoned flour for the gravy. Dredge each cube steak in the remaining flour mixture, coating both sides thoroughly and shaking off any excess.
02 - Heat the vegetable oil and 1 tablespoon of butter in a large skillet over medium-high heat until the butter is foaming. Working in batches if necessary, sear the coated cube steaks for 2 to 3 minutes per side until a deep golden crust forms. Transfer the browned steaks to a plate and set aside.
03 - 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 golden brown and fragrant.
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 lightly toast the garlic.
05 - 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.
06 - Return the seared cube steaks to the skillet, nestling them down into the gravy. Cover with a tight-fitting lid, reduce the heat to low, and simmer for 20 minutes until the steaks are fork-tender and the gravy has thickened to a rich, coating consistency.
07 - Taste the gravy and adjust the seasoning with additional salt and pepper as needed. Transfer the steaks to serving plates, spoon the onion-mushroom gravy generously over the top, and garnish with chopped fresh parsley.