Yield 36 financiers
These wild blueberry financiers are a delicate, light, and surprisingly easy to make French cake infused with the rich, nutty taste of hazelnuts and brown butter.
Preheat the oven to 350°F (175°C). Grease muffin pans (see notes) with cooking spray or softened butter, then sprinkle with flour and tap out the excess. Set aside.
To make the brown butter: Heat the butter in a small stainless steel saucepan (see notes) over medium heat until completely melted and simmering. Keep on cooking over low heat, swirling the pot from time to time. If the butter bubbles up preventing you from watching closely over the color changing (that’s the water evaporating), lift the pot off the heat for a few seconds until the bubbles recede, then put back on the heat. The butter is ready when the milk solids at the bottom of the pot turn a light brown color and the concoction gives off a delicious hazelnut aroma. When it does, remove the butter from the heat, pour in a small bowl, and let cool completely.
Put the hazelnuts and flour in the bowl of a food processor and pulse until the mixture resembles a coarse powder. Transfer to a large mixing bowl. Add the sugar, brown sugar, and baking powder, and whisk together. Add the four egg whites and whisk until they are fully incorporated and the mixture is thick and somewhat sticky. Mix in the brown butter. At this point, the dough can be stored in an airtight container in the fridge for up to two days.
When ready to bake the financiers, drop a tablespoonful of dough in each muffin cup. Sprinkle each financier with a generous teaspoonful of wild blueberries. Bake for 16 minutes, rotating the pan halfway through, until the financiers are golden brown on the edges. Let cool for 10 minutes in the pan, then transfer to a cooling rack to cool completely.
Store in an airtight container at room temperature for up to three days. The financiers can also be frozen, they will thaw in 15 to 20 minutes at room temperature. Always bring the financiers back to room temperature before eating for the best flavor.
Recipe by Food Nouveau at https://foodnouveau.com/recipes/desserts/cookies/wild-blueberry-financiers/