• Preheat oven to 350 degrees F.  Line a 9x13 inch baking pan with foil, bringing the foil up over the edges of the pan.  Spray foil lightly with non-stick cooking spray and set aside.
• Add 1 Tbsp of the butter to a large saucepan and heat over MED heat.  Add diced apples and cinnamon and cook, stirring occasionally, about 10 minutes.  Set saucepan aside.
• Melt butter and add it to a large mixing bowl.  Add in both sugars and maple syrup and stir until smooth.  Add in eggs and vanilla and stir until combined.
• Add in dry ingredients (flour, baking powder, salt, and baking soda) and stir until just combined and no flour streaks remain.  Stir in cooked apples.
• Transfer batter to prepared baking pan and spread evenly.  Bake 25-30 minutes until puffed and lightly golden brown.  Test with a toothpick inserted in the center... toothpick should have a few moist crumbs on it when removed, but no batter.
• Cool blondies in baking pan.

MAKE THE FROSTING:

• To a small mixing bowl, add maple syrup, melted butter and powdered sugar, and 1 Tbsp of the half and half, and whisk to combine.  If needed, whisk in another tablespoon of the half and half until frosting is a loose spreading consistency.
• Spread frosting over the cooled bars and let sit until frosting has set.  Use the foil overhand to lift the bars out of the baking pan.  Transfer to a cutting board and slice into bars.