A sweet and decadent chocolaty sauce to go over your biscuits or cake.
Sift the sugar, cocoa powder, flour, and salt into a large skillet or saucepan. Add the milk and whisk to combine. Cook over medium heat, stirring frequently, until slightly thickened, 7-10 minutes. Remove from the heat.
Stir in the vanilla and butter until the butter is melted and well incorporated.
Serve immediately over buttermilk biscuits, pound cake, ice cream, or as a dip for your favorite fruit.