For financiers, I use mini-muffin tins, which are easily available.
I'm not a fan of silicone bakeware but know that some people like it.
This batter is pretty forgiving so can be baked in madeleine molds or even in larger muffin tins, filling them only about halfway.
If you use another size mold, you'll likely need to adjust the baking time; bake them until browned on top, and the feel just set in the center when you touch them.
Servings 24 financiers
1 cup (140g) almond or hazelnut flour
3/4 cup plus 2 tablespoons (180g) sugar
5 tablespoons (45g) flour
generous pinch salt
4 large egg whites, at room temperature
1/2 teaspoon vanilla or almond extract
2 1/2 ounces (75g) brown butter, slightly warm (liquified)
Preheat the oven to 375ºF/180ºC and butter the insides of 24 mini muffin tins generously with softened, not melted, butter, making sure the butter the upper rims of the indentations.
In a medium bowl, mix the almond or hazelnut powder, sugar, flour and salt.
Stir in the egg whites and vanilla or almond extract, then the browned butter.