If making bacon in the oven, preheat the oven to 375°F. Line a rimmed baking sheet with parchment paper. That way, you won't get splatters all over the place. Preheat a large skillet or griddle over medium heat.
Place bacon strips in a single layer and give them a bit of room. Bake until crispy, about 20-25 minutes.
Add some of the avocado oil to a hot griddle, then add ½ cup of hash browns per burger to the griddle in a disc shape. Sprinkle with salt and pepper, and press down on the hash brown with a spatula to help the hash browns adhere to each other. You want the hash brown “disc” to be roughly the size of your burger. Add more oil as needed to help the potatoes get really crispy.
Cook until golden brown, about 3-5 minutes before flipping the hash browns. You will know that it’s ready when you’re able to flip the hash browns in one piece. Cook until crispy and golden brown on the other side, then remove from the skillet.
In a large mixing bowl, make the breakfast burger patties. Combine ground beef and ground breakfast sausage with black pepper. You will only need to add salt if there isn't any added to the prepackaged breakfast sausage.
Roll the patties into 12 equal-sized balls, without overworking the mixture too much. Each patty should weigh about 2.5 - 2.6 ounces.
Increase the heat to medium-high heat. Add the burgers to the griddle with more oil, and press them down using a burger press between parchment paper to get them nice and thin. Cook for about 2 minutes until most of the way cooked through, then flip and add a slice of cheese. Once the cheese is melted (after about 1 -2 minutes) the burgers should be done cooking, and can be removed from the skillet.
Now, lower the heat to medium-low, and add more oil to the skillet (if needed), followed by the eggs with a sprinkle of salt and pepper. Cook until the desired doneness is achieved.
Lastly, spread mayo on the insides of the buns. Reduce the heat to low and add them face down on the hot skillet. Cook for 2-3 minutes until golden brown.
Now, simply layer the hashbrowns, bacon, and patties onto each burger, then top with a fried egg. Serve with your favorite hot sauce or dipping sauce and enjoy!
Store components separately in the fridge in airtight containers. Do not freeze. We also don't recommend making the eggs in advance. Those are best if made fresh.