Sift together all dry ingredients in a large bowl and mix to combine. Cut in the shortening using a pastry blender or 2 forks. Lightly beat egg in a measuring cup and add milk until the mixture reaches 7/8 cup, then add vanilla. Stir the liquid ingredients to dry and blend until just combined. Pour the batter into a greased 8-inch cake pan, level with a spatula, and bake for 20 minutes, or until golden and a cake tester comes out clean.
Serve with a dollop of whipped cream and a spoonful of strawberries.
I have served this 2 ways: you can either split the entire shortcake in half horizontally then fill with cream and macerated berries or cut the cake into wedges and serve in bowls topped with cream and berries.