Heat the oven to 180 C. In the form of muffins put 12 paper muffin bottoms. In a large bowl mix the flour, grated chocolate, muesli, baking powder, salt and blueberries. In another bowl, whisk the eggs together with melted butter and cream. This mixture was poured into a mixture of flour and other ingredients and mix until homogeneous. Then distributed in trays of muffins. Muffins bake 25-30 minutes, then check with a toothpick - Prick out and if dry, so the muffins are ready. Vyadat from oven and allow to cool completely.