Prepare the crust by combining crushed graham crackers or almond flour with melted butter and sweetener, then press into the bottom of a greased springform pan.
In a large mixing bowl, beat the softened cream cheese until smooth, then add Greek yogurt, protein powder, sweetener, eggs, vanilla extract, lemon juice, and salt. Blend until creamy.
Pour the filling into the prepared springform pan and smooth the top with a spatula.
Preheat the oven to 325°F. Bake the cheesecake for 30-35 minutes until the edges are set and the center is slightly jiggly.
Turn off the oven and leave the cheesecake inside for an additional hour. Then refrigerate for at least 4 hours or overnight.