Caramelized Onion and White Bean Flatbread without whites

1 pound pizza dough store-bought or homemade, enough for 2 people, or as needed * 2 tablespoons olive oil 2 large red onions peeled, halved and thinly sliced[...]

2 tablespoons olive oil for cooking the onions 2 large red onions peeled, halved and thinly sliced 1/2 teaspoon thyme leaves optional * 1 tablespoon balsamic[...]