Make the spread: Add butter, butter spread, minced garlic, chives, and salt to a bowl, mix until smooth and creamy.
Prep the bread: Spread an even layer on one side of each slice, press lightly so it sticks.
Preheat: Preheat the air fryer to 170°C / 340°F for 5 minutes.
Air fry: Place bread in a single layer, air fry at 160°C / 320°F for 6 minutes, then check and cook 1 more minute if needed.
Optional cheese: Add cheese on top, air fry 1 to 2 minutes until melted.
Serve: Rest 1 minute, serve warm.
Storage: Store leftover garlic spread in an airtight container in the fridge for up to 1 week.