Preheat the oven to 180°C (356°F).
Mix almond flour, cocoa powder, erythritol, and salt in a bowl.
Add coconut oil and eggs, and mix well to form a dough.
Press the dough evenly into a tart pan.
Bake in the oven for 10 minutes, then let it cool.
Mix Greek yogurt, unsweetened cocoa powder, and erythritol to make the filling.
Spread the filling on the baked tart and let it set in the refrigerator for 30 minutes.