Preheat the oven to 400°F (200°c). If you are using a non-stick mini muffin pan you may not need to butter them, but otherwise, generously butter the cups of the pan.

Melt the butter either in a small pot on the stovetop over medium heat or in a microwave-safe bowl in the microwave for about one minute. Set aside to cool.

Beat the egg whites until frothy with handheld electric beaters on high speed, one to two minutes.

In a separate bowl, whisk together the sugar, almond meal, flour and salt.

Add the dry ingredients to the wet and fold them in gently with a rubber spatula until just combined.

Add the cooled, melted butter to the batter and use a rubber spatula to gently mix until the butter is completely incorporated.

Divide the batter between the cups of the muffin pan. You can do this with a 1 ½-tablespoon cookie scoop or a small spoon. Fill each cup almost to the top.

Bake for 10 to 12 minutes, or until the centre is slightly puffed and the edges are golden and slightly crispy and coming away from the pan. There may be cracks in the tops. That's totally okay!

Remove the financiers from the muffin pan immediately and allow to cool on wire racks.

Once they have cooled completely, sprinkle them with icing sugar to serve. These are best eaten the day they are made, although they can keep for a couple of days in an airtight container at room temperature.