Preheat air fryer to 400°F (200°C) for 3 minutes
Place bacon in air fryer basket in single layer
Cook bacon for 8 minutes until perfectly crispy
Remove bacon and drain on paper towels
Place English muffin halves in air fryer at 375°F for 2-3 minutes until golden
Meanwhile scramble eggs low and slow in butter with salt and pepper
Layer scrambled eggs on bottom English muffin half
Add crispy bacon broken in half on top of eggs
Place cheese slice on top of bacon
Return to air fryer at 350°F for 1 minute to melt cheese
Top with second English muffin half
Garnish with fresh chives and serve immediately