Put a wire rack over a rimmed baking sheet and put in the oven. Preheat the oven to 200 degrees F.
Mix the sugar and apple pie spice in a small bowl and set aside. Whisk the milk and eggs together in a large shallow dish.
Heat 1 tablespoon butter a large skillet over medium heat. Briefly dip 2 slices of bread into the egg mixture and place in the skillet. Sprinkle some of the spiced sugar on top and cook, flipping once, until browned on both sides and cooked through, 3 to 4 minutes per side. Transfer to the warm baking sheet in the oven and continue to make French toast with the remaining butter, bread, egg mixture and spiced sugar. Serve with butter and warm maple syrup.
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