Mix with sugar, butter and zest. Enter all the eggs one by one. In two stages, add the dry ingredients, alternating them with a mixture of milk and cheese. You should get a smooth, pleasant dough. Blueberries roll in flour, it will not allow the berry to settle to the bottom of the cake. You can take any berries, and even frozen (then do not thaw them). Add the berry to the dough, mix with a spatula.