Chocolate Gravy

Here is a recipe that my family loves and is a breakfast favorite (and even supper sometimes too) ;). My mom and grandma both have made this since I was a little bitty kid. Don't tell my mom, but I like my grandma's better :)

1/2 cup butter, melted
4 tablespoons flour
4 tablespoons cocoa
1 cup sugar
2 cups milk
1 teaspoon vanilla

In a skillet, mix: butter, flour, and cocoa. Add: sugar, milk, and vanilla. Cook on medium heat until thick, stirring often. Serve with hot biscuits.