Make the sausage. Place the ground meat in a bowl with the rest of the sausage ingredients. Use your hands to incorporate everything evenly, mixing and folding until the sausage forms a ball and begins to resist against your hands. At this point, stop mixing—it should be pretty sticky and will have formed a film on the sides of the bowl. If you overwork the sausage, it will become too tough.
Preheat a cast iron skillet over medium heat and add a bit of neutral oil to coat the pan. In the meantime, divide the sausage into 6 equal pieces, flattening them with your hand to form a patty. Once the skillet is preheated, place a few sausage patties onto the pan and press them down, being sure not to overcrowd them.
Flip the patties once golden brown, around 2-3 minutes, and finish the other side until fully cooked through (it should register 160℉ for pork or 165℉ for chicken/turkey on an instant-read thermometer). Top cooked sausage patties with a slice of cheese and set aside to melt.
If desired, toast your halved English muffins face down in the residual sausage drippings until golden brown. Alternatively, you can also put them in a toaster.
Assemble the sandwiches. Crack your eggs or egg whites into a bowl, season, and cook them to your preference—I like to scramble mine, but you could fry them as well.
Once the eggs are done, it's time to assemble. Place one of the cooked eggs (or ⅙ of the scrambled eggs) on the bottom of an English muffin, then add a sausage patty with cheese on top. At this point, add any toppings of choice—I like spinach, bacon, and avocado. Repeat with the remaining sandwiches.
If not serving immediately, wrap each sandwich in a bit of aluminum foil. They be stored in the fridge for up to 5 days but are best when eaten within 2 to 3, otherwise the bread can get soggy. They will also last up to three months in the freezer.
When ready to serve, thaw the sandwiches in the fridge overnight and microwave until hot, about 60-90 seconds. If needed, you can microwave the sandwiches from frozen, though they will heat unevenly. Serve warm with ketchup or hot sauce, if desired.