01 - In a shallow dish, whisk together the all-purpose flour, kosher salt, black pepper, smoked paprika, and garlic powder until evenly combined. Reserve any leftover seasoned flour for thickening the gravy.
02 - Pat the cube steaks dry with paper towels. Dredge each piece through the seasoned flour mixture, pressing gently to coat both sides. Shake off any excess flour and set the steaks aside on a plate.
03 - Heat 2 tablespoons of vegetable oil in a large skillet over medium-high heat. Working in batches to avoid crowding, sear the cube steaks for 2 to 3 minutes per side until deeply golden brown. Transfer the browned steaks to a plate and set aside.
04 - Reduce heat to medium and add the remaining 1 tablespoon of vegetable oil to the same skillet. Add the thinly sliced yellow onion and cook for 5 to 6 minutes, stirring occasionally, until softened and lightly golden.
05 - Add the minced garlic to the onions and sauté for 1 minute until fragrant. Sprinkle 2 to 3 tablespoons of the reserved seasoned flour over the onion mixture and stir continuously for 1 minute to cook out the raw flour taste.
06 - Gradually pour in the beef broth and whole milk while whisking constantly, scraping up any browned bits from the bottom of the skillet to deglaze. Stir in the Worcestershire sauce and dried thyme. Bring to a simmer and cook for 3 to 5 minutes until the gravy begins to thicken slightly.
07 - Return the browned cube steaks and any accumulated juices back to the skillet, nestling them down into the gravy. Cover with a tight-fitting lid, reduce heat to low, and simmer gently for 25 to 30 minutes until the steaks are fork-tender and the gravy has developed a rich consistency.
08 - Taste the gravy and adjust seasoning with salt and pepper as needed. Garnish with freshly chopped parsley and serve hot over creamy mashed potatoes, steamed rice, or buttered egg noodles.