Start by preparing the bacon; preheat your oven to 400 F and place your bacon on a tin foil-lined baking sheet.
Once the oven has heated, place your baking sheet into the oven and bake for 15-17 minutes.
Then, while the bacon is cooking, prepare the eggs. Wash and chop your veggies- the tomatoes, spinach, and onion- and set aside in a small bowl.
In a separate bowl, whisk together your eggs, then toss the veggies in.
Using oil or butter, grease your silicone donut pan or casserole pan and pour the egg mixture inside.
Bake for 20-25 minutes, or until the eggs are fully cooked.
While your eggs are in the oven, prepare your English muffins by slicing them in half and toasting them, if desired.
Once your eggs are done, add them to the English muffins, alongside the bacon, and assemble your sandwiches.
Cover your sandwiches in foil, freeze, and store for up to three months. When you’re ready to eat them, simply reheat and enjoy!