In a bowl mix together the eggs, cinnamon, cardamom, nutmeg, sugars, salt, milk, and heavy cream and set aside
Spread the mascarpone cheese on one side of the brioche bread, create a sandwich with another slice, then dunk both sides of the sandwich in the milk and eggs mixture
Melt butter in a skillet and cook the bread on medium heat until golden brown on each side
Toast the coconut flakes in a skillet set to medium heat until golden brown
Serve the french toast with the toasted coconut flakes, your fruit of choice, whipped cream, and maple syrup.