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Preheat oven to 350° F.
Heat olive oil in a small skillet over medium heat and add the onions. Soften for 5 minutes, then set aside.
Pat the thawed hashbrowns dry.
Set 1 cup of cheddar cheese aside for the top of the casserole, then combine all remaining ingredients in a large bowl, (hashbrowns included).
Transfer to a greased 9x13 casserole dish and top with remaining cheese.
Cover and bake for 45 minutes.
Remove cover and increase heat to 400° F. Bake for an additional 10-15 minutes, until the top begins to crisp and brown slightly.
Remove from the oven and let stand for 10 minutes prior to serving.