Line two half sheet pans with parchment paper and gently spray with cooking spray. Set aside.
Pour the entire quart of pure maple syrup into a small pot.
Use a digital or candy thermometer to measure the temperature. Do NOT stir the syrup as it heats!
Heat maple syrup 242 degrees F over low to medium heat in a small pot. (You need the pot to be small enough for the syrup to reach the thermometer.)
Spray a large pot with cooking spray and set aside while the maple syrup heats up. (You'll need this to coat the nuts later.)
Use a few drops vegetable defoamer to knock down foam. (Or use a little vegetable oil wiped around the edge of the pan with a clean, dry paper towel.)
Preheat the oven to 200 or 220 degrees F.
Dump the nuts into the large pot.
Once you reach 242 degrees F quickly pour that over the pecans in the large pot. Work quickly to toss the pecans in the hot syrup with a rubber spatula, large wooden or heat resistant spoon. Be sure to coat all the nuts thoroughly. The syrup will change from glossy to becoming crystalized sugar with an opaque color.
Dump the maple coated nuts onto the prepared sheet pans evenly. Place the sheet pans in the preheated oven. Shut the oven OFF.
Leave the sheet pans in the oven for 1-2 hours, until they dry thoroughly. Toss them occasionally during this process to make sure they are evenly dry.
Package the nuts, while still warm in an airtight container. We prefer to package them in either glass quart Mason jars or quart deli containers.
Store the nuts in an airtight container in room temperature, away from direct sunlight for up to 6-8 months.