In a bowl, mix the cream, milk and vanilla powder or split vanilla pod.
Cook over a low heat in a pan and bring to the boil.
Then turn off the heat and leave to cool until the temperature reaches about 30°C.
In a separate bowl, whisk the egg yolks and sugar together gently.
Once the cream has cooled, remove the vanilla pod (scrape out all the seeds) if you have used one. Then very gently pour over the egg + sugar mixture, making it run down the side of the bowl. This is to avoid adding air bubbles to the mixture.
Then mix very gently with a wooden spatula, again to avoid adding air bubbles.
Place the 4 ramekins in a large baking dish that will hold them.
Then pour your mixture into the ramekins up to 2/3 of the height. You can use a cheesecloth to prevent air bubbles.
Place your dish on the baking tray or rack of the oven.
Boil some water. Pour the water into the casserole dish until the level almost reaches the edge of the ramekins.
Close the oven and heat to 110°C (gas mark 3/4).
After twenty minutes, check the cooking: a film should start to form on the top of the crème brûlée but the cream should remain very creamy and melting inside. I check this with the tip of a knife. Usually I bake it for 26/27 minutes in total (with a gas oven). The cooking time will depend on your oven so check fairly regularly.
Then immediately remove the creme brulee from the oven and dish.
Let them cool down a bit before placing them in the refrigerator for at least 4 hours.
Take the creams out just before serving.
You can either sprinkle them with brown sugar (you don't want to put too much, a thin layer covering about the top of the cream is enough) or with caramel chips.
Melt the sugar or caramel with a blowtorch and leave to harden for 1 minute and enjoy!