Preheat the oven to 350 degrees.
Line a sheet pan with parchment paper - this is essential to keep the nuts from sticking (for extra insurance, spray with cooking spray).
Place the pecans in a mound in the center of the baking sheet. Drizzle with maple syrup, then sprinkle with rosemary and salt.
Use your hands to mix everything together, then spread them out into an even layer.
Bake for approximately 15 minutes, but keep an eye on them as they can easily burn. Check half way through cooking and rotate the pan if needed. They're done when the nuts smell toasty and the maple syrup is bubbling.
Remove from the oven and allow to cool for about 5-10 minutes until the syrup has hardened.
Use your fingers to break them apart into pieces. Transfer to a bowl and serve while still warm.***