Preheat oven to 350 degrees.
Mix eggs, sugar, maple syrup, pumpkin, Greek yogurt, and vanilla extract.
In a separate bowl, combine white and whole wheat flours, cinnamon, pumpkin pie spice, baking soda, baking powder, and salt.
Slowly add dry ingredients to pumpkin mixture. Mix well.
Add batter to a baking pan. I baked in a 3 quart Pyrex dish {13.25 x 9.25}.**
Bake for 30-35 minutes.
Let the bars cool for at least 20 minutes before frosting. To make the Cinnamon Glaze, whisk ingredients together. For thicker frosting, add more powdered sugar and/or milk until you get the desired texture.
Store bars in the refrigerator or freeze.