How many movies have Gert Verhulst and Olaf Janssens collaborated on?

They have worked on 23 movies together! Their first movie together was Plop and the Gnome Treasure (1999) while their highest rated movie together was Plop en de Kabouter Paashaas (2010). They have not worked together since K3 Love Cruise (2017). They are most known for their family films together.