Heat the butter slowly in a saucepan until it starts to change color and turn light brown. Remove immediately from the stove and let it cool down a little.
In a large bowl, mix the rice flour, potato starch, sugar, almond and pistachio powders.
Whisk the egg whites until foamy (no more, it should not get stiff) and fold them into the dry mixture. Stir in the melted butter.
Divide the cake batter into the mini financier molds. Gently press two fresh raspberries in each financier.
Bake for about 10-12 minutes or until golden brown. Let them cool down on a rack. Bon appétit!
Notes
If you don't have ground pistachio in your pantry, you can make it buy mixing non-salted ones. Or simply replace with ground almond.
Recipe by Chocolate & Quinoa at http://www.chocolateandquinoa.com/raspberry-pistachio-financiers-gluten-free-refined-sugar-free/