Lightly grease the insert to a large (6 quart) slow cooker with nonstick spray. Layer 1/3 of the hashbrowns on the bottom, then lightly sprinkle with salt and pepper. Top with 1/3 of the cooked sausage, then 1/3 of each the onions and cheese. Repeat layers two more times, ending with the cheese.
In a medium bowl, whisk together the eggs and seasonings. Pour over the layers in the slow cooker. Cook on low for 6 to 8 hours or high for 3-4 hours.
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