Preheat your oven to 350°F (175°C).
In a mixing bowl, cream together the butter and sugar until light and fluffy.
Add the eggs one at a time, beating well after each addition.
Stir in the sour cream and vanilla extract.
In another bowl, whisk together the flour, baking powder, baking soda, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Pour the batter into a greased baking pan.
Bake for 30 minutes or until a toothpick inserted into the center comes out clean.
Let the cake cool before serving.