In a large bowl, crack 16 eggs and add 1/3 cup cottage cheese. Season with salt and pepper. Whisk well and set aside.
In a large pan or skillet over medium high heat, cook ground sausage until brown and no longer pink, breaking apart into small pieces with the end of your spatula. Once cooked, remove the meat, drain some grease, and set the meat aside.
In the same pan over medium heat, add diced onion. Sauté for 1-2 minutes and season with salt and pepper. Add chopped spinach and cook until wilted. Once everything is cooked, set aside.
In the bowl of whisked eggs, add cooked sausage, and sautéd onions and spinach. Stir to combine.
Grease a sheet pan with butter then pour in the egg mixture flat on the pan.
Place the sheet pan into the oven to bake for 15-20 minutes.
Once the egg is cooked through, remove from the oven and slice into squares.
Assemble the sandwich by slicing an English muffin in half, add an egg square, and top with cheese. Close the sandwich and wrap in aluminum foil or parchment paper. Store in the freezer for up to 3 months or serve immediately.
Note: to reheat, unwrap the sandwich and place it into a damp paper towel. Microwave for 2-3 minutes and enjoy!
