Heat oven to 375°F.
Spray a 8x8 inch baking dish with spray oil and set aside.
In a large bowl, beat the eggs and milk together. Fold in the turkey bacon, mushrooms, spinach and salt. Pour the egg mixture into the baking dish.
Bake for 20-25 minutes or until cooked through (center should not jiggle).
Allow to cool completely, then cut into 4 circles (using a glass or measuring cup) or into 4 squares.
Assemble the sandwiches: one serving of egg with a slice of cheese between the english muffin.
Storage InstructionsWrap each sandwich in a small ziplock bag, and store in the fridge (up to 4 days) or in the freezer (up to 3 months)
Re-heating instructions:Thaw overnight in the fridge (if frozen).
Heat in the microwave for 30 seconds to heat through.
Crisp up in the frying pan or on a George Foreman grill.