Pour the mixture into a large baking sheet. Place the bread slices into the pan and soak for about a minute on each side.
Serve immediately or place on a baking sheet and place in the preheated oven to keep warm. Repeat, buttering the pan each time, until all the bread is cooked. Serve with maple syrup, whipped cream or fruit.
Note 1. You can sweeten the custard with brown sugar, granulated sugar, honey, or maple syrup.
Note 2. Use your favorite gluten-free bread. It's best if it's slightly dry. You can do this by placing it into a 250℉ oven for a few minutes.