Brown the ground beef in a large skillet over medium-high heat. Drain any excess grease and set aside.
Cook the bacon until crisp. Crumble and divide into two portions.
In a large bowl, combine the frozen hash browns, cooked ground beef, half of the bacon, garlic, salt, pepper, Worcestershire sauce, steak seasoning, cream of mushroom soup, and milk. Stir until well combined.
Spray a 9×13-inch baking dish with nonstick cooking spray.
Spread the mixture evenly in the prepared baking dish and top with the shredded cheddar cheese.
Cover with foil and bake for 1 hour.
Remove the foil and top with the remaining bacon. Bake for another 30 minutes, or until the potatoes are fork-tender.
Let the casserole rest for 10 minutes before cutting and serving.