In a medium-sized microwave safe bowl, melt the butter if you haven’t already.Then add the rest of the ingredients and stir to combine thoroughly.Spoon the batter into 2 mugs, or 4 small paper baking cups.Microwave for 1 minute on high if using the baking cups, 1 minute and 30 seconds if cooking both mugs.Check for doneness and if still liquid in the center microwave for 10 second increments until just set.Serve warm.