Set your air fryer to 390°F (199°C) and let it preheat for a few minutes.

Place the bacon slices in the air fryer basket. Cook for about 7-10 minutes, or until crispy, depending on the thickness of the bacon. Once done, transfer to a paper towel-lined plate to drain excess grease.

Lightly grease a small, heat-safe bowl or cup with non-stick spray or a bit of oil. Crack an egg into the bowl, season with salt and pepper, and lightly beat it. Alternatively, you can leave the egg whole for a dippier yolk.

Place the bowl in the air fryer and cook at 370°F (187°C) for 3-4 minutes, or until the egg is cooked to your liking.

If desired, lightly butter each slice of bread for extra flavor and crispiness. Place the bread slices in the air fryer basket and cook at 370°F (187°C) for about 2-3 minutes, or until toasted to your preference. You might need to do this step in batches, depending on the size of your air fryer.

On one slice of toasted bread, layer the cooked bacon, followed by the cooked egg. Place a slice of cheese on top of the hot egg so it begins to melt.

Top with the second slice of toasted bread. If desired, you can return the whole sandwich to the air fryer for an additional minute to ensure the cheese is fully melted and the sandwich is heated through.

Serve:

Cut the sandwich in half, if desired, and serve immediately while warm and crispy.