Preheat oven to 350 degrees F. Line an 18 by 13-inch baking sheet with parchment paper. In a small bowl whisk together sugar and cinnamon, set aside.
In a medium mixing bowl, vigorously whisk together milk, eggs, vanilla and salt until very well blended. Cut each slice of bread into even three strips (you can layer a few slices to cut several at a time). Dip each portion (I usually dip 2 sticks at a time) into egg mixture then lift and let excess run off and transfer to prepared baking sheet (they will have to fit closely together but leave just a little space between them).
Bake in preheated oven for 13 minutes. Remove from oven, flip french toast sticks to opposite side and brush tops lightly with remaining 1 Tbsp melted butter and sprinkle evenly with remaining cinnamon sugar mixture. Return to oven and continue to bake until cooked through, about 13 - 18 minutes longer. Let cool for a few minutes. Brush lightly with a little more melted butter if desired and serve warm with maple syrup for dipping.
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