Wash the apple thoroughly, peel it, and cut it into small cubes.
Melt butter in a pan and add the apple cubes to sauté.
Add sugar and cinnamon powder, then simmer until the apples become soft.
Remove from heat and let cool.
Melt the chocolate using a double boiler.
Place the cooled stewed apples in a bowl and pour in the melted chocolate, mixing well.
Transfer to a cup and refrigerate for 30 minutes until set.