01 - Slice croissants in half horizontally using a bread knife.
02 - Evenly coat the bottom halves of croissants with a generous layer of softened goat cheese.
03 - Distribute apple slices over the goat cheese, ensuring an even layer.
04 - Drizzle honey or fig jam over the apple layer, if desired.
05 - Arrange arugula or baby spinach over the apples and season with freshly ground black pepper.
06 - Top with chopped walnuts or pecans, if using.
07 - Close each croissant with its top half and serve immediately, or wrap and refrigerate for up to 2 hours.