For a cake type shortcake I use this recipe. 
Basic Yellow Cake 
2 1/4 cups all-purpose flour (do not sift the flour)
1 1/2 cups granulated sugar 
3 1/2 teaspoons baking powder 
1-teaspoon salt 
1 1/4 cups milk
Vegetable oil 
1 stick butter (not margarine), softened 
1-tablespoon vanilla extract 
3 large eggs 
Preheat oven to 350°
Grease and flour a jelly roll cake pan.
In a large mixing bowl combine the flour, sugar, baking powder and salt, mixing well. 
Measure the 1-1/4 cups of milk in a 2 cup measuring cup
.then add enough vegetable oil to bring the liquid up to 1-1/3 cups. 
Add the milk/vegetable oil mixture, butter and vanilla to the flour mixture and beat with an electric mixer on medium to medium-high speed for 2 minutes, scraping sides of bowl as needed. 
Add the eggs and continue beating an additional 2 minutes. Pour batter into prepared pans. 
Bake at 350° for 15 minutes or until a wooden pick inserted near center of cake comes out clean, or until cake springs back when touched lightly in the center.
Cool completely and cut into squares.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Biscuit Type Shortcakes
2 c. flour
1/3 c. sugar
1 Tbs. baking powder
1/2 tsp. salt
1/3 c. shortening
1 large egg
3/4 c. milk 
Preheat oven to 400°.
Mix dry ingredients together. Cut in the shortening with a pastry cutter until pieces are the size of a small English pea. 
Beat egg and stir in the milk; add to flour and mix till all the flour is wet. 
Turn dough out on a floured surface and knead 20 strokes. Pat the biscuits down to about 1/2 inch thickness and cut with a biscuit cutter. 
Bake on parchment paper or a greased cookie sheet, in a 400° oven for 10 to 12 minutes or till well browned.