To Make Ahead: Make the Brown Betty as directed and bake for the initial 45 minutes, covered. Remove the dish from the oven, uncover it, and let it cool. Refrigerate the dessert overnight. Remove the dessert from the refrigerator 2 hours before serving, to allow it to come to room temperature. If desired, warm the dessert before serving by baking at 375°F, covered for 10 minutes, and then uncovered for 10 minutes.