For the best flavor use avocados that are just ripe, without any dark or stringy spots, so the avocado flavor stays in the background. If your blender struggles, add an extra splash of almond milk, a teaspoon at a time, until the blades move easily while still keeping the mousse thick. Store leftovers in an airtight container in the refrigerator for up to three days and stir gently before serving to restore a silky texture. To keep carbs low, use only a small amount of berries per portion and choose sugar free chocolate that is at least seventy percent cocoa with a keto friendly sweetener.