Preheat oven to 160 C
Grease 6 mini Bundt tins.
Cream butter and sugar until light and fluffy.
Beat in eggs, one at a time.
Sift together flour, baking powder and cinnamon then add to the wet ingredients.
Spoon batter into the tins then bake for about 30 minutes or until a skewer inserted comes out clean.
Remove from the tin and leave cakes to cool completely.
For the glaze, place icing sugar and cinnamon into a bowl, then slowly mix in enough milk until the mixture reaches the correct consistency.
Drizzle glaze over the cooled cakes.