Spray a 1-quart covered baking dish with Pam or use 1 teaspoon butter. Press maple sugar firmly against sides and bottom of dish to form a 1/8-inch thick shell. Spread bread slices with remaining butter and cut them into bite-size pieces, dropping them into shell. Beat eggs until frothy and slowly beat in cream, milk and vanilla. Pour this mixture over bread. Set dish in pan of warm water and bake in 350 degree oven, covered, about 1 hour. Note: If possible, use Abm bread in this recipe, as the result is much more flavorful!