Preheat oven to 350 degrees F (175 degrees C). Grease a 9x13 inch baking dish.
In a medium bowl, cream together the butter and sugar. 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 in the prepared baking dish.
In a medium bowl, whisk together the pudding mix and 2 cups cold milk until thick. Spread over the cake layer.
In a large glass or metal bowl, beat egg whites and cream of tartar until soft peaks form. Gradually add the sugar and beat until stiff peaks form. Spread over the pudding layer.
Bake for 30 minutes in the preheated oven, or until golden brown.
Interesting Facts
Ring-Tum-Ditty is believed to have originated in the United States in the 1930s.
This recipe is a perfect combination of sweet and creamy flavors that everyone will love.
It's a great dessert to bring to a potluck or family gathering.