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Preheat the oven to 350°F.
Lightly butter a 5x5-inch or 4x6-inch baking dish. Place it on a rimmed baking sheet to catch any spills.
In a small bowl, beat the butter and sugar with an electric mixer until combined.
Add the egg, lemon juice, and vanilla. Beat until smooth.
In another bowl, whisk together the flour, baking powder, and salt.
Add the dry ingredients to the wet mixture and mix until just combined.
Stir in the milk.
Pour the batter into the prepared dish. Bake for 40–45 minutes, until the top is golden.
Cool for 10 minutes, then invert onto a plate and slice.