Preheat the oven to 400 degrees.
Heat the oil in a skillet over medium heat. Add the zucchini, squash & dry seasonings. Cook until slightly tender (about 5 minutes), stirring frequently - see notes. Set aside.
Place the flatbread dough on a baking sheet. Spread the Boursin out in an even layer on the dough. Top with the zucchini slices and place in the oven for 8 minutes, or until the cheese is melted and the crust is crispy.
Remove from the oven, top with pickled onions & oregano and cut into slices.
