OK, you can do this. This is tough though. NEVER UNDER COOK CHICKEN. Under cooked chicken is both disgusting and dangerous. Overcooked chicken is just tough and disgusting, but not dangerous,
The key is to NOT OVERCOOK THE CHICKEN, and NOT UNDER COOK CHICKEN. Its a tough balancing act, but if you experiment with your microwave and are patient you can learn to do this perfectly every time.
You will have to go for more of a casserole type dish. I assume you are using 2 chicken breasts and a casserole bowl. I would advise washing the chicken, drying it, salting it and peppering it and then cutting it into small slices, then cutting those into half slices. Microwave that about a minute, stir then another minute, then another till hot and barely cooked, but not tough! SET ASIDE. 3 mins or so ought to do it for 2 cups of chicken. Now make a basic casserole. Use a chopped up onion CUT SMALL, some chopped up celery SMALL SLICES, a couple spoons of BUTTER - NOT MARGARINE. Add 2 and a quarter cups of preferably whole milk. Microwave till steaming, then stir in rice (4-6 minutes or so). Add in a cup and a half of instant rice. Let it sit for 2 minutes.
Now add mushroom soup or a can of some equally thick soup you prefer, a cup of seasoned chicken stuffing, and some shredded cheese (I like something sharp), and a vegetable something to give it a kick like sriracha and a few seed removed jalapenos or poblano peppers or green chilies. Add chicken, stir, and then Microwave for seven minutes or so, stirring once.
Sprinkle with some more cheese and breadcrumbs. Cover and wait 4 minutes. DONE.
Your resulting meal will be tasty and filling, without dangerous hot spots. This casserole should be moderately acceptable - like a B or so.
You can take this basic idea and make chicken and melted cheese and serve that with salsa and nachoes as meal as well.
Invest in a speed oven with a crisping pan and some olive oil to brush the chicken with. Its the same size as a microwave and SO MUCH BETTER. Also try and pony up for the largest wattage you can - I recommend 800W min. Higher watts tend to cook more evenly, and a rotating pan can help.
Pre-cooked chicken breast is less of a hassle and tastes just as good as if you learn to cook it yourself from scratch properly.