Preheat oven to 400 degrees Fahrenheit
Spray a mini muffin or financier mold with non-stick spray
Place butter in a pan over medium-low heat
Melt butter and whirl the pan occasionally
When butter turns brown and develops a nutty aroma, remove from heat and strain. Cool for a few minutes
In a bowl, whisk the egg whites until frothy
In another bowl, combine the flour, almond flour, confectioners sugar, baking powder, and salt.
Gently mix in the cooled brown butter, egg whites, and vanilla using a whisk or a wooden spoon. Do not overmix
Pour the batter 3/4 full of each crevice of the mold
Place the raspberry inside the batter
Bake for 10-15 minutes or until the tops becomes brown and the financiers are fluffy and springy to the touch
Remove from oven
Unmold
Enjoy!