Melt 2 tablespoons butter in a large skillet over medium high heat.
Make the custard
Whisk together 2 large eggs and ½ cup milk, then add 1 tablespoon maple syrup and ½ teaspoons cinnamon.
Dip and cook
Add the custard to a shallow bowl, and dip each slice of bread in the custard, making sure to flip several times, using a total of 4 slices brioche bread. Let the excess drip off and cook in batches 2-3 minutes each side until golden brown and cooked through.
Serve
Top with butter, maple syrup and powdered sugar if desired.