Place the creamy nut butter, protein powder, sweetener, molasses, cinnamon, ginger, nutmeg, and allspice into your food processor.
Secure the lid and begin processing on a low setting. The mixture will initially be very thick and crumbly.
While the food processor is running, slowly drizzle in the almond milk, one tablespoon at a time. The amount you need will depend on the type of protein powder and nut butter you use.
Continue to process until the mixture is completely smooth, creamy, and has reached your desired consistency. You may need to stop and scrape down the sides with a spatula to ensure all ingredients are fully incorporated.
Once finished, transfer the homemade cookie butter into a sealable jar. It will thicken slightly as it sits. Store in the refrigerator for up to a week for optimal freshness.