Step 1

Preheat the oven to 350°F. Spray a 9x13 inch pan with cooking spray. Set aside.

Step 2

In a medium skillet, brown the ground beef and the onion. Drain and set aside.

Step 3

Meanwhile, in a medium saucepan, melt the butter over medium low heat. Stir in the flour. Slowly add in the beef broth and milk, mixing until smooth. Bring to a gentle boil, cooking until thickened.

Step 4

Remove from heat and add in the cream of mushroom soup and water.

Step 5

Layer the bottom of the prepared dish with 1/2 of the potatoes, then 1/2 the soup mixture, then 1/2 the ground beef mixture. Repeat with the remaining potatoes, soup mixture and ground beef.

Step 6

Sprinkle the cheese over the mixture. Cover with aluminium foil and cook in the preheated oven for 75-90 minute. Remove and cook uncovered for an additional 5 minutes.