Prepare Baking Sheet: Line a large baking sheet with parchment paper or a silicone baking mat. Set aside.
Combine Ingredients: In a large bowl, combine granulated sugar, brown sugar, water, and maple syrup. Stir together until the sugar is completely dissolved.
Add Flavors: Stir in cinnamon, vanilla extract, and salt. Mix well until all ingredients are incorporated and the mixture has a smooth texture.
Coat the Pecans: Add the pecan halves to the bowl. Toss well to ensure that each pecan is thoroughly coated with the syrup mixture.
Bake: Using a slotted spoon, transfer the coated pecans to the prepared baking sheet, spreading them out in a single layer. Make sure to leave space between each pecan to prevent them from sticking together as they cook.
Dry the Pecans: Place the baking sheet in a preheated oven at 300°F (150°C). Bake for about 25-30 minutes, stirring on the pan once or twice, ensuring the pecans are evenly coated and toasted.
Cool and Serve: Once baked, remove the pecans from the oven and let them cool completely on the baking sheet. They will become crunchier as they cool.