Using electric mixer, blend the three ingredients together. Chill; store in the fridge (airtight container). Will keep for several months. If mixture separates during refrigeration, just stir to re-blend mixture.
Applying the mixture can be a bit messy but you can use a small piece of paper towel, small sponge paint brush or a pastry brush. Although not in the original recipe, I like coating my baking pans with sugar after applying the Dobie mix. I have found it helps to rotate the sugar mixture around in the baking pan (sides and bottom) with an oblong platter underneath to catch the excess sugar. This forms a nice crust that people tend to notice and enjoy. Allow baked items to cool for about 10 minutes on a wire baking rack before turning them out onto another baking/cooling rack.
This is a little more work but it's worth it!