Soft butter is covered with sugar and very well knead. After everything has turned into a homogeneous mass, add the egg and knead well again. Add the soda and quench it with lemon juice. Or you can add baking powder. Add the flour and knead the dough. From the dough, form a rounded cookie, spread it on a baking sheet. You should get 9 pieces. Put 5 pieces of m&Ms pills on top. Remove to bake in the oven for ~25 minutes at a temperature of 180 degrees.