Veggie Swops: You can use any root veg here, as long as you cut it into thin slithers (it only has 20min to soften in the oven). You can off course use regular carrots here and I think golden or candy beetroot (not red) would look pretty enough to eat.
You can use any cheese here baring in mind that some cheeses melt better than others. Gruyere and fontina would be amazing.
You can use a thick greek yogurt here instead of creme fraiche.
If you want to go dairy free you can use pesto instead of cheese.