Using a teaspoon, scoop out the center of the zucchinis so that they look like boats.
Line a parchment paper in a baking pan or butter the bottom of it. Place the zucchini boats in it. Put 1 teaspoon butter in each boat. Sprinkle salt over each and bake for 15 minutes.
For the filling, combine the cheeses, parsley and dill in a medium bowl.
Remove the zucchini boats from oven and share the cheese mixture into each boat. Bake for abother 25-30 minutes or until their top gets slightly golden.
Serve warm.
NOTES
Not to waste the zucchini flesh that you scoop out, keep it in a freezer bag in the freezer to use later when making zucchini fritters.