01 -
Slice Yukon gold potatoes into 3 millimetre thick rounds and submerge in water to prevent browning.
02 -
Preheat oven to 175°C. Lightly coat a 23x33 centimetre baking dish with nonstick spray and set aside.
03 -
In a large saucepan over medium-high heat, sauté the ground beef, diced onion and minced garlic until the meat is evenly browned and onions are soft. Drain excess fat.
04 -
In a medium bowl, stir together cream of mushroom soup, half and half, onion powder, kosher salt, and cracked black pepper until smooth and fully homogenized.
05 -
Drain potato slices. Layer one third of the potatoes in the prepared baking dish. Top with one third of the beef mixture, sprinkle with 85 grams of shredded Colby jack cheese, and spoon over one third of the soup mixture. Repeat for a second layer.
06 -
Arrange the remaining potatoes and beef mixture as the third layer. Pour over the remaining soup mixture and cover with 170 grams of shredded Colby jack cheese.
07 -
Cover the dish tightly with aluminium foil. Bake for 70 minutes. Remove foil and continue baking uncovered for 20 minutes until the cheese is bubbling and golden. Allow casserole to rest for 15 minutes before portioning and serving.