01 - Set the oven to 375°F.
02 - Combine flour and salt in a bowl. Cut in cold butter until mixture resembles coarse crumbs. Add ice water, one tablespoon at a time, until dough forms. Shape into a disk, wrap in plastic wrap, and chill for 20 minutes.
03 - On a lightly floured surface, roll dough to fit a 9-inch tart pan. Press dough into the pan, trimming excess. Prick base evenly with a fork.
04 - Line the pastry with parchment paper and fill with pie weights or dried beans. Bake 15 minutes, remove weights and paper, then bake 5 more minutes. Remove from oven and set aside.
05 - Heat olive oil in a skillet over medium heat. Cook onion, zucchini, and bell pepper for 5 to 7 minutes until tender but firm. Allow to cool slightly.
06 - Whisk eggs, heavy cream, salt, and pepper in a bowl. Fold in half the cheese and half the herbs.
07 - Arrange sautéed vegetables and cherry tomatoes evenly over the crust. Pour the egg custard mixture on top. Sprinkle remaining cheese and herbs over the surface.
08 - Bake for 25 to 30 minutes until the filling is set and the top is golden brown. Let cool briefly before slicing.