Here is a simple vanilla custard recipe.
what you will need:
2 cups of milk
2 egg yolks
½ cup sugar
1 tbsp flour
1 tsp vanilla extract
what you need to do:
Heat milk until small bubbles form around edge. Remove from heat.
Beat egg yolks with sugar and flour until smooth.
Whisk in hot milk. Transfer to a saucepan.
Cook over medium heat, stirring constantly, until sauce comes to a simmer.
Cook 1 minute longer then remove from heat and stir in vanilla.