4 ingredient chocolate mousse

INGREDIENTS 9oz dark chocolate (my favorite refined sugar free chocolate is this one) 3/4 cup warmed milk or cream (nut milk works too if you are df) 2 egg yolks, room temp 4 egg whites, room temp 1/2 tsp vanilla extract Optional: whipped cream or dollop of yogurt, chocolate shavings, raspberries, blackberries, mint for garnish