Preheat the oven to 200°C (400°F) using static heat.
Melt the butter and let it cool.
Whisk the egg yolks with the sugar until the mixture becomes pale.
Stir in the cooled melted butter to obtain a smooth, creamy batter.
Add the flour (without baking powder) and mix until combined, then add the almond flour and mix again until the dough is homogeneous.
Scoop out walnut sized portions of dough with a tablespoon and shape them into balls. I made 18 g balls.
Arrange the cookies on a parchment lined baking sheet, leaving a little space between each one. Gently press them down with the palm of your hand to slightly flatten the tops.
Bake for 8 to 10 minutes, until the cookies are very lightly golden on top. They should remain very pale. They will darken slightly as they cool.
Quick note: This almond cookies bake fast, so keep a close eye on them to avoid overbaking.
Transfer the cookies to a wire rack and let them cool completely before serving or storing.