Blend the base: In a blender or food processor, add pumpkin puree, Greek yogurt, cottage cheese (if using), protein powder, maple syrup, vanilla, pumpkin pie spice, and salt.
Blend until completely smooth, scraping the sides as needed.
Check sweetness and spice: Taste and adjust with more maple syrup or spice. The protein powder sweetness varies, so tweak to your preference.
Adjust thickness: For a thicker, spoonable pudding, add chia seeds or a small amount of instant pudding mix and blend briefly. For a softer pudding, add milk 1 tablespoon at a time until it reaches your desired consistency.
Chill to set: Transfer to a bowl or portion into cups.
Cover and refrigerate for at least 1–2 hours. The flavors meld and the texture firms up as it chills.
Garnish and serve: Top with a swirl of whipped cream, a sprinkle of cinnamon, and crushed graham crackers or nuts for a pie-like finish.
Optional dessert upgrade: Spoon into a prepared graham cracker crust and chill 4 hours for a no-bake, high-protein “pie.”