In a large bowl or the bowl of a stand mixer with dough hook whisk together whole wheat flour, bread flour, and salt.
In a medium bowl whisk together water, sourdough starter, and olive oil until start has dissolved.
Add wet ingredient mixture to dry ingredient mixture and mix until a shaggy dough comes together.
Knead dough by hand or with mixer on medium speed until dough is smooth and tacky, but not sticky. This should take about 5-7 minutes by hand or 3-4 by machine. If adding any herbs or seeds, knead them in towards the end until evenly incorporated.
Transfer dough to a clear bowl or container. Mark the top of the doughs position on the outside of the container with a washable marker or rubber band. Cover with plastic wrap or a damp towel until doubled in volume, about 3-6 hours (See note).
Line a large sheet pan with parchment paper. Punch down dough and transfer to sheet pan. Stretch dough into an oval about 15x8-inches.
With a sharp paring knife cut a slit down the center of the dough. Cut 4 diagonal slits on either side of the one you made in the center. Gently stretch out the dough to emphasize the openings and cut away any dough that did not completely separate on the first cut.
Cover with lightly greased plastic wrap or a towel and allow to rise until puffy and about doubled in volume, around 2-4 hours.
Preheat oven to 400°. Brush dough with olive oil and sprinkle with salt, parmesan cheese, and/or more herbs and seeds. Bake for about 25-30 minutes or until golden brown. Remove to a wire rack to cool. Enjoy warm or at room temperature (see note).