Butterscotch without cornstarch

I love two things most of all about chess pie — that sweet, buttery baked custard pie well-known across the South but whose reach can be tasted in everything[...]

2 tablespoons butter , softened 2 tablespoons shortening 1 cup packed brown sugar 1 egg 1 teaspoon vanilla extract 1 1/2 cups all purpose flour 3/4 teaspoon[...]