Lightly spray each jar with cooking spray. For filling the jars, It's easiest to pour the pie into a bowl that you can easily ladle from or that has a pour spout, however, you can use a ladle to put the filling into the jars.
Fill each jar to the just below the threads on the jar. Add some of the candied pecans, just eyeball this. Fingertip close the jars - by this I mean, do NOT close the jars tightly. I tighten the jars & then do a short turn back. This allows air to escape from the jars during the cooking process.