Preheat the oven to 425 F.
In a 9x9 pan, combine the frozen hashbrowns and the vegetable oil.
Cook at 425 F for 20 minutes.
Dice the onion, bell pepper, and tomato.
In a bowl, mix together the milk, eggs, cheese, and seasonings (minus the parsley!).
Add in the diced vegetables and mix to combine.
Once the hashbrowns are out of the oven, top with the egg and vegetable mixture.
Return to the oven and bake uncovered for 35 minutes.
Top with dried parsley.
Enjoy!