In a large bowl (or the bowl of the electric mixer), mix water, yeast, sugar, salt and olive oil. Add flour and mix by hand or electric mixer (do not knead). The dough will be soft.
Cover with plastic wrap and let rise in a warm place away from drafts for 2 hours.
Drizzle olive oil onto a baking dish measuring 8×12-inch. Spread the dough on top, stretching it with your fingertips. Drizzle more olive oil over the dough, and then add the vegetables and fresh herbs on top. Press down gently with your fingers to slightly embed the vegetables into the dough, allowing them to be coated with oil. Sprinkle flaky sea salt on top.
Let it rest for another 20 minutes and then place it in a preheated oven at 410°F/210°C for 30 minutes or until golden brown.
