Grease two 9x9 or 8x11 pans. Preheat oven to 350 F.
In a medium bowl, stir together chicken, yogurt, broth, cream of chicken soup, bouillon, onion, peppers, and garlic powder.
Pour half of chicken mixture into each pan.
Cover chicken mixture with hash browns.
Season hasbrowns with salt and pepper.
To eat now, bake one pan for about 30 minutes, or until hash browns are browned.
Sprinkle with 3/4 cup cheese and continue to bake for about 5-10 more minutes, or until cheese melts.
To freeze for later, after step 5, cover one pan tightly with plastic wrap and then aluminum foil. Freeze until ready to use. You can put a baggie in with the cheese.
When ready to eat, thaw overnight. Bake as directed above, adding about 15 or so extra minutes to the cooking time.