Mix together the graham cracker crumbs, butter, and salt until they clump together.
Divide evenly into the bottoms of a lined mini muffin tin and bake at 350°F for 5 minutes.
In a bowl, whisk together cream cheese, Greek yogurt, protein powder, pumpkin puree, maple syrup, spices, vanilla, and egg until smooth.
Portion over the crusts and bake for 15–18 minutes, until set but still slightly jiggly.
Cool completely, then chill for at least 2 hours.
Top with light whipped cream or a dust of cinnamon before serving.