Preheat your oven to 375°F and lightly grease a 6-ounce ceramic ramekin with a small amount of coconut oil or cooking spray.
In a medium mixing bowl, whisk together the chocolate protein powder, oat flour, cocoa powder, monk fruit sweetener, baking powder, and sea salt until no lumps remain.
Add the egg whites, Greek yogurt, creamy almond butter, and vanilla extract to the dry mixture, stirring until a thick and glossy batter forms.
Pour the batter into the prepared ramekin and smooth the top with a spatula.
Bake for 12 to 14 minutes, ensuring the edges are set while the center remains slightly soft and jiggly to create the lava effect.
While the cake bakes, combine the raspberries, honey, and water in a small saucepan over medium heat, mashing the berries as they soften.
Simmer the raspberry mixture for 5 minutes, then strain through a fine-mesh sieve into a small bowl to create a smooth coulis.
Remove the cake from the oven and let it rest for 2 minutes before carefully inverting it onto a serving plate.
Drizzle the warm raspberry coulis over the top of the cake and serve immediately while the center is still warm and molten.