THESE COCONUT COOKIES MELT IN YOUR MOUTH

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125 gr. butter at room temperature
Half a glass of powdered sugar (with a 200 ml glass)
1 egg yolk
Half pack of vanilla
Half a packet of baking powder
2 tablespoons coconut for the filling
1.5-2 cups of flour
2-3 tablespoons coconut for coating
1 egg white
Optional bain-marie melted chocolate for topping