Step 1

Spray a 13x9 baking dish with cooking spray and preheat oven to 350 degrees.

Step 2

Add ground beef and onion to a large skillet, season with salt and pepper then cook until ground beef is cooked though and crumbled. Drain fat then set aside.

Step 3

Cut potatoes into thin slices (less than 1/4 inch). Add one layer of potato slices to the bottom of the baking dish. Sprinkle potatoes with salt and pepper.

Step 4

Top potatoes with 1/4 of beef mixture. Top beef with 1/4 of shredded cheese. Repeat this process three more times.

Step 5

Combine condensed cheddar soup, evaporated milk, milk, salt and pepper then whisk until smooth. Pour mixture over potato/beef/cheese layers.

Step 6

Cover dish tightly with aluminum foil then bake at 350 degrees for one hour. Remove foil then continue baking for an additional 15-20 minutes or until potatoes are tender and dish is light golden brown and bubbly.