You can try, although oven-baking is a better method. Place each filled avocado half in a microwave-safe bowl and pierce the yolk and white with a fork a few times to prevent them from exploding. Next, cover the bowl with cling wrap (make sure it doesn't touch the food), leaving a small corner uncovered to allow for venting. Microwave on high until the egg whites are set. Start with 30 seconds and add more cooking time (10 seconds at a time) as needed. If the egg starts making popping sounds, stop the microwave immediately.