Use slightly stale bread: Day-old or slightly dry bread will soak up the egg mixture better without falling apart, giving the casserole a nice texture.
Let the bread soak fully: Allow the mixture to sit for at least 15 minutes so the bread absorbs the liquid evenly. You can also cover and refrigerate it overnight for an easy make-ahead option.
Grease the baking dish well: This helps prevent sticking and makes cleanup easier.
Check for doneness: The casserole is ready when the center is set and the top is golden brown. If it’s browning too quickly, loosely cover with foil during the last 10–15 minutes of baking.
Customize the fruit: Use your favorite fresh or frozen berries, or a combination, for variety. If using frozen, don’t thaw first to avoid excess moisture.
Serve with toppings: Try extra maple syrup, powdered sugar, or a dollop Blueberry Compote or Honey Lemon Curd for a finishing touch.