Preheat oven to 350F. Whisk eggs with salt and pepper, then pour into a greased 9x13 inch baking dish. Bake for 15 minutes or until set. Slice into 6 equal squares.

Slice English muffins in half and lightly toast them.

Assemble each sandwich: place one egg square on the bottom half of a muffin, top with 2 oz of beef slices and one slice of cheddar cheese, then cover with the top muffin half.

Wrap each assembled sandwich tightly in aluminum foil or parchment paper.

Place wrapped sandwiches in a large zip-top freezer bag and store in the freezer for up to 1 month. To reheat, unwrap and microwave for 1-2 minutes until heated through.