Yellow Cake as we like it

2 1/2 cups flour
1 2/3 cups sugar
2/3 cup shortening
1 teaspoon salt
3/4 cup milk
3 1/2 teaspoons baking powder
1/2 cup milk
3 whole eggs
1 teaspoon vanilla

Mix the flour, sugar, shortening, salt and 3/4 cup milk. Beat for 2 minutes, then add baking powder. Mix for another 2 minutes. Add remaining ingredients. Mixing well. Bake at 375 degrees for 45 minutes in a 9 x 13 pan. 20 minutes for layers