01 -
Cook the frozen fries on a tray according to their package.
02 -
Prepare a greased nine-by-thirteen-inch baking dish and set the oven to 400°F for the casserole. Heat olive oil in a skillet.
03 -
Cook ground beef in crumbles until it reaches 160°F and drain excess fat. Add onion and garlic and cook until softened.
04 -
Stir in ketchup, mustard, salt and pepper and simmer briefly.
05 -
Spread the cooked fries across the prepared dish. Distribute the beef mixture evenly over them.
06 -
Drizzle with milk and add cheddar plus optional mozzarella. Bake about twenty-five to thirty minutes, continuing until the center reaches 165°F.
07 -
Cover loosely if browning too quickly. Finish with optional pickles and serve, expecting a softened potato base.