In a large bowl, whisk together the flour, baking powder, cinnamon, and vanilla sugar.
In a separate bowl, cream the softened butter and sugar until light and fluffy. Beat in the eggs one at a time, mixing well after each addition.
Grate the lemon zest into the butter-egg mixture, squeeze in the lemon juice, and stir to combine.
Gradually add the dry ingredients to the wet ingredients, alternating with the milk, and mix until just combined. Be careful not to overmix.
Pour the batter into a greased and floured cake pan, and spread evenly.
Bake in a preheated oven at 350°F (180°C) for 35-40 minutes, or until a toothpick inserted into the center comes out clean.
Let the cake cool completely in the pan before slicing or decorating.
Before serving, dust with powdered sugar, or prepare a lemon glaze for the top.
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