Preheat oven to 325°F (160°C) and lightly grease a small oven-safe ramekin or 4-inch springform pan.
Mix the almond flour and melted coconut oil in a small bowl until it reaches a sandy consistency, then press it firmly into the bottom of the pan to form the crust.
In a separate mixing bowl, whisk together the Greek yogurt, egg white, whey protein, and half of the monkfruit sweetener until the batter is completely smooth and lump-free.
Pour the yogurt mixture over the almond crust and bake for 25-30 minutes until the edges are set but the center still has a slight jiggle.
While the cheesecake is baking, combine the mixed berries and the remaining monkfruit sweetener in a small saucepan over medium heat.
Simmer the berries for 8-10 minutes, mashing them slightly with a spoon, until the liquid reduces into a thick, jammy compote.
Remove the cheesecake from the oven and let it cool to room temperature, then refrigerate for at least 2 hours to fully set.
Top the chilled cheesecake with the warm or cooled berry compote before serving.