In a large bowl with a loose-fitting, ventilated lid, microwave the butter for one minute or until melted. Add the popcorn kernels and mix lightly to make sure all of them are coated in melted butter. Place the bowl with the lid loosely covering it in the microwave and cook it on HIGH for 5-6 minutes or until there are 3-4 second pauses between popping. Carefully remove the bowl (it will be hot) and season your popcorn as desired. My favorite option is a 1:3 ratio of garlic powder and salt. Here's a situation where lighter salt makes a lot more sense than heavier coarse salts, which will simply fall to the bottom of the bowl. If desired, more melted butter can be added as well.