Cook your crostini rounds as per recipe instructions through the link below if not done already. This can be done up to two days in advance and the crostini kept in an airtight bag or container.
Preheat oven to 400F.
Place the crostini on a silicone baking mat on a cookie sheet in a single layer. Spread approximately 1 Tablespoon of nutella onto each crostini. You will need more or less depending on the diameter size of your bread.
Cut the brie into strips 1/8 inch wide. You can leave the rind on the brie (it is edible). Cut the brie strips down to just shorter than each piece of bread and place on top of the crostini.
Place the crostini in the oven and cook just until the brie is starting to melt, approximately 7-10 minutes.
Remove from the oven and sprinkle with a sea salt or flaky salt. Serve immediately.
Notes
You can use more or less of the brie and Nutella as desired or needed. The exact diameter of your bread will vary and require different amounts of these ingredients.Learn how to make the base crostini here!