Add the butter to a mixer fitted with a paddle attachment and whisk. Then add the brown sugar and whisk to blend. Turn the mixer on low and slowly add the oats, flour, salt, baking soda, pumpkin pie spice and cinnamon. Mix until thoroughly blended.
Press half of the mixture into the prepared pan. Press firmly to create a sturdy base.
Then whisk the jam in a small bowl so that it is easier to spread. Using the back of a metal spoon, smear the jam over the base but do NOT bring the jam to the edges or it will burn and stick to the side of your pan. Stop with about 1/2 - 1” to spare.
Sprinkle the remaining crumb mixture over top.
Bake for about 20 - 25 minutes or until the top is lightly browned.
Remove and cool completely. Cut into bars with a serrated edged knife to serve.
Recipe by Just a Smidgen at https://justasmidgen.com/2014/09/10/carrot-cake-jam-bars/