In a pie plate or shallow dish whisk your eggs, add milk, sugar, vanilla extract, lemon zest,and cardamom. Whisk until well combined.
Prep a parchment lined baking sheet for cooked French toast.
Add 1 tablespoon butter to a skillet or non stick pan and place over medium heat.
Place brioche into pie plate one at a time. Turn to coat and let soak for about 30 seconds per side depending on how thick your slices are. Place in skillet or non stick pan with melted butter.
Transfer more pieces of brioche and fill pan with as many pieces of brioche as will fit without touching. Cook for 3 to 4 minutes or until golden brown and then flip the bread and cook for another 3 to 4 minutes on the other side. Repeat with other pieces of brioche. It is important that the skillet is on medium heat to be able to cook through without burning.
When the French toast, is ready, do not pile on top of each other, place on a parchment. line baking sheet until ready to serve.
Serve with remaining butter and maple syrup. Other topping suggestions include fresh strawberries, whipped cream or powdered sugar.