Preheat the oven to 180°C / 350°F
Using an electric whisk, cream the softened butter and sugar together. Add the egg and vanilla and mix well until the color is light and white-ish.
Add 1/2 of the flour, the baking powder, and the salt. Add the milk and combine all the ingredients well before adding the last 1/2 of the flour.
Mix well until smooth.
Bake for 25 - 30 min.
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