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
Beat until smooth
Pour the batter into the prepared pan
Bake for 25 to 35 minutes
Check doneness with a toothpick
Let the cake cool in the pan for 10 minutes
Remove the cake from the pan and cool completely
Frost or decorate if desired