In a large bowl, mix the flour, levain*, herbs, garlic powder, olive oil, and sea salt.
Mix the ingredients until a sticky dough forms.
Form the dough into a ball and press it into a patty, about ½ inch thick. Transfer to a plate and place in the refrigerator for at least 30 minutes.
Preheat oven to 350°F and line two baking sheets with parchment paper or silicone baking mats.
When the dough is chilled, place it on a lightly floured work surface. Roll the dough out until it is no thicker than ¼ inch.
Use a pastry wheel or a sharp knife to cut the crackers into rectangles. Take any scraps from the edges and roll them out again to cut more crackers. Repeat until all the dough is used up.
Transfer the crackers to the prepared baking sheets.
Brush the crackers with olive oil and sprinkle Celtic sea salt on top. Bake for 20-25 minutes or until they become golden on the edges.
Remove from oven and let cool before serving with Parmesan cheese slices and a drizzle of honey.