Place butter in a small sauce pan and heat on medium until melted. Then, continue to heat until there are no more bubbles coming up and the whistling has reduced (about 5min). Pass your brown butter through the sift. Set aside.
In a mixing bowl, whisk together almond flour and confectioner sugar. Add the egg whites, all-purpose flour, sea salt, the cooled brown butter, and whisk gently until smooth. Fold the sliced peach.
Bake for 25 minutes at 350F/180C. (Every oven heats differently, monitor your financier from 22min). It is ready when the toothpick inserted into the center comes out clean.
Once your Flat Peach Almond Financier Cake is out of the oven, let it cool down for about 10min. Then, Unmold, Serve and Enjoy! Bon Appétit!
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