In a small bowl, combine butter and cinnamon; spread over one side of each slice of bread. Place four slices, buttered side up, in a greased 8-in. square baking dish (trim to fit if necessary). Sprinkle with 2 tablespoons brown sugar. Repeat with remaining bread and brown sugar.
In a large bowl, whisk the eggs, milk, syrup and vanilla; pour over bread. Cover and refrigerate overnight.
Remove from the refrigerator 30 minutes before baking. Bake, uncovered, at 350° for 40-50 minutes or until a knife inserted near the center comes out clean. Serve with additional syrup. Yield: 4 servings.