1. Pour the milk or cream into a small bowl and then sprinkle the gelatin on top. Set aside.
2. Whisk the egg yolks and the sugar together.
3. Heat the milk mixture over medium heat until it just starts to simmer. Do not boil. Remove from the heat.
4. To temper the eggs, slowly whisk the hot milk into the egg mixture. Once the eggs and hot milk mixture is combined, cook the mixture in a double boiler or over simmering water, stirring, until it starts to thicken and simmer. Add the vanilla. Place the bowl in an ice bath and stir until the mixture cools to room temperature.
5. Whip the second measure of whipped cream. Fold in the whipped cream. Refrigerate until you are ready to use the Bavarian Cream.