Use one slice of bread torn into pieces and place in a food processor bowl and add 1 tablespoon brown sugar and ¼ teaspoon cinnamon. Pulse until finely ground. Place in a bowl that the bread slices will fit into.
Whisk milk, egg, sugar, 2 tablespoons melted butter, vanilla, cinnamon and salt into a large bowl until well blended. Transfer mixture to a 13x9 pan.
Soak bread in milk mixture until saturated but not falling apart, about 20 seconds, per side.
While bread is soaking, melt butter in a medium skillet.
Once bread has soaked, place one side of the soaked bread into the crumb mixture and gently press down to allow the side touching the crumbs to get evenly coated.
Place crunchy side down into melted butter and allow it to get golden brown. About 3-4 minutes, use spatula to gently lift and make sure it does not burn.
Flip over and allow the other side to get golden brown.
Transfer to baking sheet and place in oven to keep warm until all the slices are toasted.
More butter will need to be re added to the skillet for the other slices to get golden brown.