Preheat oven to 350°F (180°C).
Spray 9-inch (23 cm) square baking pan with cooking spray. Arrange bread slices in pan, overlapping slightly.
Whisk eggs, milk, bacon and 1/4 cup (50 mL) cheese in large bowl. Add mushrooms. Pour mixture over bread slices. Sprinkle potatoes and remaining cheese over egg mixture.
Bake in preheated 350°F (180°C) oven until lightly browned and knife inserted near centre comes out clean, about 35 minutes.
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