If they could talk, they would not always say "Ich bin ein Berliner". They are actually called pfannkuchen in the city of Berlin and krapfen in Bavaria.
They're often filled with different kinds of fruit jam and creams. This variant with vanilla custard is mostly known in Belgium and the Netherlands.
You could use vanilla custard (powder) from the store or make it yourself.
Tools used: Wooden spatula, whisk, mixing bowl, sieve.