Preheat the oven to 375 degrees and line a baking sheet with aluminum foil. Slice the baguette into 24, 3/4 inch slices. Dip each slice into a shallow dish with the dressing, coating one side, then place on the baking sheet, dressing side up.
Slice the mozzarella into 24 strips and lay one strip on each slice of bread.
Bake for 15 minutes, or until melted and bubbly.
While the bread is baking, slice the tomatoes and dice the basil. When the bread is out of the oven, layer each piece with a couple slices of tomato, a pinch of diced basil and a sprinkle of kosher salt. Drizzle with the balsamic reduction and enjoy!