Preheat oven to 350 degrees F (175 degrees C). Grease and flour a 9 inch square pan.
In a medium bowl, cream together the butter and sugar until light and fluffy. Beat in the eggs one at a time, then stir in the vanilla. Combine the flour, baking powder, and salt; stir into the creamed mixture alternately with the milk. Spread evenly into the prepared pan.
Bake for 30 to 35 minutes in the preheated oven, or until a toothpick inserted into the center of the cake comes out clean. Let cool in pan for 10 minutes, then turn out onto a wire rack and cool completely.
Interesting Facts
Kentucky Butter Cake is a classic Southern dessert that has been enjoyed for generations.
It is a very popular cake for potlucks, family gatherings, and other special occasions.
The cake gets its rich flavor from the butter and sugar, and its moist texture from the eggs and milk.