First start on your homemade biscuits, linked above, make Crisco Biscuits or make Bisquick biscuits with directions on back of the box. While they are baking make gravy by;
In a medium sized saucepan or pot add the sugar, cocoa powder, salt and flour, whisking together until most clumps are gone. Add in the milk and turn the heat on medium.
Whisk together and the mixture will begin to look like a hot chocolate. Continuously whisk over the heat and as it begins to boil, the chocolate sauce will thicken.
Stir for about 5-8 minutes or until the chocolate mixture has become similar to the consistency of gravy Take off the heat and add the butter and vanilla extract, mixing until melted. Enjoy!