Line a large-rimmed baking sheet with parchment paper or a silicone mat and spray it lightly with nonstick cooking spray.
Heat a large nonstick skillet over medium heat and add the pecan halves. Toast the pecans for 3-4 minutes, stirring occasionally, or until they are fragrant. Remove the toasted pecans from the skillet and set them aside to cool.
In the same skillet set over medium heat, combine the light brown sugar, water, butter, kosher salt, ground cinnamon, and ground nutmeg.
Bring the mixture to a gentle boil and cook it for 1-2 minutes, or until it thickens slightly.
Add the toasted pecans back into the skillet and toss them in the brown sugar mixture until they are evenly coated. Cook for an additional minute.
Transfer the candied pecans to the prepared baking sheet and spread them out into a single layer. Allow them to cool completely at room temperature before transferring to an airtight container.
Candied pecans will keep at room temperature for up to 10 days.