If your thick bread isn’t stale, cut it into cubes and spread them on a baking sheet. Bake the bread cubes at 300°F for about 15 minutes until they’re slightly dry and golden.

Take a 9x13 inch baking pan and generously grease it with non-stick spray or butter. Layer the toasted bread cubes in the pan.

In a large measuring cup, combine applesauce or mashed banana, your chosen milk, and egg whites (or additional milk). Add maple syrup and pure vanilla extract. Whisk everything together until smooth.

Evenly pour the mixture over the bread cubes in the baking pan and press down the bread into the liquid.

Spread your choice of fresh or thawed berries on top of the bread mixture and cover the pan tightly with plastic wrap.

Place the covered casserole in the refrigerator and let it sit overnight.

The next morning, preheat your oven to 350°F.

Uncover the casserole and bake it in the preheated oven for about 1 hour, or until it’s lightly golden on top and set in the center.

After baking, allow the casserole to cool for about 10 minutes before slicing. Serve warm or at room temperature.