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Preheat the oven to 180°C. Grease and line two round cake pans.
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In a bowl, whisk together flour, baking powder, and salt. Set aside.
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In a large bowl, beat the butter and sugar until light and fluffy. This should take about 3–4 minutes.
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Add eggs one at a time, mixing well after each addition. Stir in vanilla extract.
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Add the dry ingredients in batches, alternating with milk. Mix gently until smooth.
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Divide the batter evenly between the pans. Bake for 25–30 minutes or until a toothpick inserted in the center comes out clean.
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Let the cakes cool in the pans for 10 minutes, then transfer to a rack to cool fully.
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Beat butter until smooth. Gradually add powdered sugar, then mix in vanilla, milk, and a pinch of salt. Beat until creamy and spreadable.
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Place one cake layer on a plate, spread buttercream evenly on top, then add the second layer. Cover the top and sides with the remaining frosting.
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Smooth the frosting and slice once ready. The cake is best enjoyed fresh but can be stored covered for a couple of days