Place the softened cream cheese, sweetener, and protein powder in a large bowl and use a hand mixer to combine until smooth. Taste and adjust sweetness to your liking.
Place the mixture into the bottom of a parchment lined 8x8 inch baking dish. Set aside while you make the pumpkin pie swirl.
To make the pumpkin swirl, place the pumpkin puree, sweetener, protein powder, and pumpkin pie spice into a large bowl.
Use a hand mixer to combine until smooth. Taste and adjust sweetness to your liking.
Pour over the cheesecake layer and use a knife to swirl the pumpkin mixture into the cheesecake layer. Place in fridge for 6 hours to set. Cut into 12 squares.