Arrange the bread slices in a single layer in a large pan. Pour the custard sauce over the bread slices. Flip them once to make sure they're well coated. Cover with plastic wrap and leave them in the refrigerator overnight.
The next morning, heat up a griddle or pan to medium.
Add butter to griddle. Start with one tablespoon and add more if needed.
As soon as the butter is melted, place French toast slices on griddle.
Cook 2 to 3 minutes or until side down is brown. Flip and repeat, adding more butter if needed.
Cook until second side is brown and the center is firm to touch.
Remove and serve warm with Fresh Blueberry Orange Syrup.
make Blueberry Orange Sauce:
Add all ingredients, except blueberries, to a small saucepan. Whisk together well.
Add blueberries and cook, over medium heat, until sauce is thickened.