Preheat the oven to 350 degrees. Grease a 1/4 sheet pan or 13x9 baking dish with butter or baking spray. In a blender, blend pumpkin puree, eggs, milk, honey, flour, and pumpkin pie spice until smooth. Pour 1/3 of the mixture on the bottom of the sheet or baking dish, spreading the batter evenly around the bottom. Place bread side by side, on top of the batter, and pour the remaining batter over the top of the bread. Spread the batter evenly around the top. Sprinkle each piece of bread with cinnamon sugar, if desired. Bake for 20-25 minutes, or until French toast is golden brown and the custard has set. Serve with maple syrup, whipped cream, pecans, and/or powdered sugar, if desired.Enjoy!