Preheat the oven to 325°F (160°C) and line an 8x8 inch baking pan with parchment paper.
In a medium mixing bowl, combine the oat flour, 1 scoop of protein powder, honey, and almond milk until a thick dough forms.
Press the dough firmly and evenly into the bottom of the prepared baking pan to form the crust layer.
In a separate large bowl, beat the softened cream cheese, Greek yogurt, and sweetener until smooth and aerated.
Whisk in the egg, remaining 1 scoop of protein powder, lemon juice, lemon zest, and vanilla extract until fully incorporated.
Pour the lemon cheesecake batter over the crust and smooth the top with a spatula.
Bake for 30-35 minutes, or until the edges are firm and the center is slightly jiggly.
Remove from the oven and let cool at room temperature for 30 minutes.
Refrigerate for at least 3 hours to allow the bars to set fully before slicing into 8 rectangular bars.