Preheat your oven to 350°F (180°C). Grease and lightly flour a bundt pan to prevent the cake from sticking.
In a large mixing bowl, whisk together the all-purpose flour, rolled oats, baking powder, and lemon zest. This ensures the baking powder is evenly distributed.
In another bowl, cream together the softened butter, granulated sugar, and vanilla sugar until light and fluffy.
Add the eggs one at a time to the butter mixture, mixing well after each addition to maintain an airy batter.
Stir in the lemon juice. Gradually add the dry ingredients and the milk alternately to the wet ingredients, beginning and ending with the dry ingredients, to keep the batter consistent.
Pour the batter into the prepared bundt pan and spread evenly with a spatula.
Bake in the preheated oven for approximately 40-45 minutes, or until a wooden skewer inserted into the center comes out clean. Avoid opening the oven during the first 30 minutes to prevent the cake from collapsing.
Once baked, let the cake cool in the pan for 10 minutes before inverting it onto a wire rack to cool completely.
Before serving, dust with powdered sugar and slice. This cake is excellent with a cup of hot tea or coffee.
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