Preheat oven at 350 degrees F (180 C)
In a large bowl mix the milk, the egg, feta (save a handful for sprinkling on top), olive oil and ½ teaspoon salt.
Add the butternut squash and mix.
Add the flour gradually until you have a thickish dough, it should not be very dense.
Empty dough in a large greased pan, the thickness of the dough should be about less than an inch deep-not higher.
Sprinkle with the rest of the crumbled feta.
Bake for about an hour until golden.
Serve slightly cooled with freshly ground pepper. You can also drizzle some honey.