Combine the nut flour, all-purpose flour, baking powder and salt and then add browned butter and vanilla before incorporating egg whites that have been beaten to stiff peaks.
Bake the cupcakes for 14 minutes and let them cool on a wire rack an dthen tried one.
Frosting: whip about 1/3 cup of heavy cream until it thickened some, then add a little less than 2 teaspoons of sugar as well as 1 tablespoon of freshly squeezed orange juice and some orange zest. Whip until stiff peaks formed and then piped onto my cupcakes, with just enough for all of them. Specks of orange zest in the whip cream and it had just enough orange flavor to announce its presence without being overwhelming.
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