Remove the butter from the refrigerator 30 minutes before cooking. Measure out the required amount of ingredients. Prepare a saucepan with a thick bottom.
Pour cocoa and powdered sugar into a saucepan, add sour cream. Place the container on the stove. Turn on low heat. Stir constantly until a homogeneous mass is formed. Add the butter and continue stirring until it is completely melted.
Remove the saucepan from the heat and cool the sour cream frosting to room temperature.
This glaze can be served as a topping for cheesecakes and pancakes in small bowls. Or use cake frosting: pour the frosting over the cake, refrigerate the cake for 2-3 hours, and then serve. The frozen glaze becomes dense and slightly crispy.