Preheat your oven to 350°F (175°C). Line a rimmed baking sheet with parchment paper or a silicone baking mat to prevent any sticking and to make cleanup easier.
Take the chilled Brie cheese out of the refrigerator. Cut the cheese into small cubes, approximately half an inch in size. Keeping the cheese cold makes it much easier to slice without it sticking to your knife.
Place the mini phyllo shells onto the prepared baking sheet. Place one cube of Brie cheese into each shell. Top each piece of cheese with a generous sprinkle of chopped pecans.
Slide the baking sheet into the oven and bake for 8 to 10 minutes. You want the cheese to be melted and bubbly, and the phyllo shells to be lightly golden and extra crispy.
Remove the tray from the oven. While the bites are still hot, drizzle a small amount of honey over each one. Sprinkle with minced fresh rosemary and a tiny pinch of sea salt if desired for extra depth of flavor.