Heat the butter in a pot until it melts. Add the heavy cream and cook till it’s hot. Mix in the white chocolate and keep cooking to the phase when the chocolate is completely melted. Turn down the heat and add the sugar, vanilla extract and rum. Mix and then add the coconut flakes. Mix well and let it cool down, so you can put it in the fridge.
When it’s completely cold, in about 2 hours, take it out of the fridge, and the dough should be hard enough, so you can form little balls.
Prepare the coconut flakes in a bowl. Melt the white chocolate in a microwave and soak each ball in the chocolate, so it covers the half of the ball, then roll it in the coconut flakes.
When you made all the balls, put them in the fridge for 2 hours.