You can put the tart under the grill for a few minutes at the end to brown the top.
Remarks
For a smoother filling mixture, you can use a hand blender to combine the cream with the feta and herbs.
If you don't like feta, you can just leave it out, or replace it with mozarella or a blue cheese like roquefort, but the taste will be very different. The essence of this recipe is the combination of courgette and mint.
And to drink?
Try a Cabernet-Sauvignon rosé from the Pays d'Oc produced by Baron Philippe de Rothschild, chilled but not too cold. Under this name, seen as somewhat pompous and "Old France", lurks a producer with a broad range of wines (the enlightened opinion of my friend Robert, who introduced me to them).