Instructions:

Combine the soup with thawed hashbrowns, chopped onion, 1 cup of shredded cheddar cheese, and shredded chicken. Blend well by stirring.

Put Casserole Together: Transfer the ingredients to the baking dish that has been preheated. Before serving, top with the remaining half cup of cheddar cheese. Toss in some breadcrumbs or crumbled cornflakes if you want.
Prepare for baking by preheating oven to 400°F. Bake for 45 to 50 minutes, or until bubbling and lightly browned.
Before you serve, give it a little time to chill. Toss in some parsley for garnish, if you want.