Cheesy beef and potato bake layers seasoned ground beef, sliced potatoes, and melted cheese for a hearty family casserole. This protein-rich one-dish dinner is comfort food perfection.
Preheat the oven to 375°F. Grease a 9x13-inch baking dish lightly with olive oil to prevent sticking.
Peel and thinly slice the potatoes (about 1/8 inch thick). Spread half of the sliced potatoes evenly on the bottom of the dish.
Heat 1 tbsp olive oil in a skillet over medium-high heat. Add chopped onion and cook until soft, about 3 minutes, then add ground beef, breaking it up as it browns. Season with salt, pepper, garlic powder, and dried thyme.
Once the beef is cooked through and moisture mostly evaporated, turn off the heat. Spread half the beef mixture over the potatoes in the dish.
Sprinkle 1 cup of cheddar cheese over the beef layer. Add the remainder of the potatoes as a second layer, then the rest of the beef, and drizzle the milk over evenly.
Top with the remaining 1 cup cheddar cheese. Cover the dish tightly with foil and bake for 40 minutes, then remove the foil and bake uncovered for 20-25 minutes, until the potatoes are fork-tender and the cheese is golden and bubbly.
Let rest for 10 minutes to allow layers to set. Slice and serve hot.