Beat eggs,half and half,sugar, 2tsp cinnamon and vanilla extract in 13x9x2inch glass baking dish to blend. Add bread and turn to coat. Cover and chill until bread absorbs egg mixture at least 30 minutes and up to 1 day.
Melt butter in heavy large skillet over medium heat. Add bread and cook until golden and cooked through about 3 minutes per side. Transfer to plates. Combine powdered sugar with remaining 1 tsp cinnamon and sift over toast. Serve with maple syrup, if desired.