Preheat oven to 325°F (163°C). Grease a 9-inch springform pan and wrap the bottom with foil.
Allow all ingredients to come to room temperature.
In a bowl, mix crust ingredients until texture resembles wet sand.
Press evenly into prepared pan. Bake crust for 10 minutes. Let cool.
Beat softened cream cheese until fluffy (3-4 minutes).
Gradually add protein powder. Mix well.
Add Greek yogurt. Mix until smooth.
Add eggs one at a time, mixing gently after each.
Add sweetener, vanilla extract, and vanilla paste.
Slowly add heavy cream while mixing on low.
Sift in cornstarch. Mix until just combined.
Pour filling over crust and smooth top.
Place springform pan in a larger roasting pan and fill with hot water (water bath).
Bake 55–65 minutes until center is nearly set (still jiggles slightly).
Remove and cool slowly at room temperature. Then refrigerate.
Slice with a warm knife for clean edges.
Serving Size: 1 slice (1/12 of cake)