2. Meanwhile, cook the egg:
Lazy method: crack the egg into a ramekin (approximately the same diameter as the muffin), season with salt and pepper, pierce the yolk, cover with a slice of bacon, and cook in the microwave for 30 to 60 seconds: keep an eye on it (the yolk might explode, and that would be a disaster).
Alternatively, cook the egg sunny-side up, season with salt and pepper, and flip it towards the end of cooking to achieve a creamy yolk texture. Quickly grill the bacon slice in a hot pan.