To a bowl, add the eggs, milk, cinnamon powder, and light brown sugar. Beat, and beat well.
On medium heat, add a large skillet, and add about one tablespoon of unsalted butter, and let it melt. Swirl it around.
Take a slice of zucchini bread, and be careful as the bread should be on the moist side, and dunk it into to the egg mixture, making sure to coat all sides.
Cook for a few minutes, on each side, or until the egg mixture is cooked through. Remove, and repeat.
Serve immediately with syrup or powdered sugar.