Steps
1. Preheat oven to 180°C (350°F).
2. In a bowl, whisk the egg and sugar until light and fluffy.
3. Add vegetable oil, milk, and vanilla extract, then mix well.
4. Sift flour, baking powder, and salt together.
5. Gently fold the dry ingredients into the wet mixture until just combined.
6. Pour the batter into a small greased cake pan or ramekin.
7. Bake for 15-18 minutes or until a toothpick inserted comes out clean.
8. Let cool slightly before serving.