Mix flour, sugar, and baking powder in a bowl.
Combine milk, oil, vanilla extract, and vinegar until smooth.
Gradually add wet ingredients to dry, whisking to form a smooth batter.
Set your oven to 180°C and grease a cake pan.
Pour the batter into the pan, spreading it evenly with a spatula.
Bake for 30-35 minutes until a toothpick comes out clean.
Let the cake cool before adding frosting, sprinkles, or desired decorations.