Step 1

Preheat oven to 350 degrees.

Step 2

Heat olive oil in a small skillet over medium heat and add the onions. Soften for 5 minutes, then set aside.

Step 3

Ensure that your hash browns have thawed. (Otherwise they take a very long time to bake.) You can defrost them in the microwave to speed up this process.

Step 4

Pat them dry of excess water.

Step 5

Set 1 cup of cheddar cheese aside.

Step 6

Combine all remaining ingredients in a large bowl.

Step 7

Place it in a greased 9x13 casserole dish and top with remaining cheese.

Step 8

Cover and bake for 35 minutes.

Step 9

Remove cover and increase heat to 400°. Bake for an additional 5-10 minutes, until the top begins to crisp and brown slightly.

Step 10

Remove from the oven and let stand for 10 minutes prior to serving.