Start by heating your oven to 375°F and lightly greasing your 9 x 13 baking pan. This keeps the casserole from sticking and helps it bake evenly.
Cook the ground beef in a skillet with garlic powder, dried onion, pepper, and salt. Once browned, drain away the excess fat to keep the casserole from getting oily.
Combine the hash browns, taco seasoning, cooked beef, cheddar cheese soup, and one cup of shredded cheese in a large bowl. Mix gently until everything is coated.
Spread the mixture in your prepared baking dish and top with the remaining cheese. Bake uncovered for 25–30 minutes, until the top is golden and bubbly.
Let it cool slightly before serving. You can add sour cream, salsa, diced tomatoes, or green onions for extra flavor.