Line an 8x8 baking dish with parchment & spray lightly with cooking spray or oil. Allow sides to hang over a little. Set aside.
Preheat oven to 325 degrees.
In mixer- combine butter & brown sugar. Beat well until light & fluffy & well combined.
Add in eggs & vanilla- mix until just combined.
Add in flour, baking soda & salt - beat well.
Stir in 1/2 the bag of cinnamon chips.
Fold in 2 tbsp pumpkin butter.
Transfer to prepared pan.
Spread remaining pumpkin butter over top in a light layer.
Sprinkle with the desired amount of remaining cinnamon chips.
Bake 55-65 minutes or until toothpick test is mostly clean.
Allow to cool 30 minutes in pan.
Remove with parchment by pulling up & cool for an additional 1 hour.
Cut & store in airtight container.