Wash and peel the potatoes, then thinly slice them. Dice the onion and mince the garlic.
In a large skillet, heat over medium heat. Add the ground beef and cook until browned, about 5-7 minutes. Drain excess fat, then add the onion and garlic. Sauté for 3-4 minutes until the onion is translucent.
Grease a 9x13-inch baking dish. Layer half of the sliced potatoes, half of the beef mixture, half of the soup mixture, and half of the peas. Repeat the layers.
Cover with aluminum foil and bake at 350°F for 45 minutes. Remove foil, sprinkle cheese on top, and bake uncovered for an additional 15-20 minutes until cheese is melted and bubbly.
Let the casserole cool for 5-10 minutes before serving.