Preheat the oven to 350°F (175°C)
Grease and flour a cake pan
Mix flour, sugar, baking powder, and salt in a bowl
Add eggs, milk, melted butter, and vanilla
Stir until smooth
Pour the batter into the prepared pan
Bake until a toothpick comes out clean
Remove from the oven
Let the cake cool in the pan
Transfer the cake to a rack
Frost or serve as desired