Start by browning all your butter. This will be for both the batter and the icing. As your butter melts, you’ll notice it going through clear stages: First, the butter melts, then it begins to foam.The milk solids start to brown and settle at the bottom of the pan. Stir occasionally (not constantly) with your wooden spoon. You’ll notice a nutty aroma developing – this is your signal to pay close attention. Once the butter solids turn golden brown and smell toasty, immediately remove the pan from the heat and transfer to heat-proof bowl. This entire process should take about 5 to 7 minutes.
Preheat Oven to 350 degrees F.
Mill your flour. Add salt, cinnamon, baking powder and baking soda to your flour. Mix with a whisk.
Add brown sugar, eggs, vanilla and 1 cup of the brown butter to a seperate bowl. Whisk until fully incorporated. Set remaining brown butter aside for later.
Add the dry ingredients to the wet ingredients and mix until just incorporated with a dutch whisk. Once mixed, fold in the cubed peaches.
Baked in an 8 by 8 baking dish for 35-40 minutes.
While your blondies are baking, whisk together the remaining browned butter, milk and powdered sugar until smooth.
Remove your blondies from the oven and let them cool for 30 minutes. Then top with your icing. You may need to heat your icing up for easy spreading.
Enjoy!