For lactose intolerance, use dairy-free milk and cheese. For a gluten-free version, use a gluten-free flour blend. Crispy fried onions can add extra crunch. Using organic ingredients offers a cleaner bake; opt for lower-fat cheese or skim milk for a lighter version. Fresh chives are best, but 1 Tbsp dried chives can be used. Good quality sharp cheddar makes a significant difference. Avoid over-boiling potatoes to prevent mushiness, and ensure they are very well-drained to prevent a watery bake. Do not overmix once potatoes are in the sauce. If the bake seems too dry after baking, splash in 1-2 Tbsp warm milk or broth before serving. For extra richness, use heavy cream in place of some milk; for a lighter version, use 2% milk. A pinch of cayenne pepper in the sauce adds a subtle, warming kick.