Preheat oven to 450°F. Stir together flour, baking powder, and salt in a medium bowl. Add very coarsely freshly ground black pepper and stir the dry ingredients to incorporate. Make a well in centre, then add water and oil and gradually stir into the flour with a wooden spoon until a dough forms.
1 ¾ cups all-purpose flour, ¼ - ½ teaspoon of coarsely ground black pepper, 1 teaspoon baking powder, ¾ teaspoon salt, ½ cup water, ⅓ cup olive oil plus more for brushing
Knead dough gently on a work surface 4 or 5 times into a smooth ball.
Divide dough into 6 equal pieces. Roll out each of the dough pieces with a rolling pin on a lightly floured work surface, into a rustic long baton shape. The rolled dough should be very thin.
Lightly brush the top of the flatbread with additional olive oil and sprinkle with sea salt and a little more pepper.
flaky sea salt
Bake the remaining dough in batches, on a baking sheet lined with parchment paper or sprayed with non-stick baking spray. Bake until flatbread crackers are pale golden brown, 8 to 10 min. Let the baked crackers cool on wire racks.
Notes
Crackers can be made 2 days ahead and stored in an airtight container at room temperature, though they're best enjoyed fresh.
Roll crackers as thin as possible for the crispiest results.
Substitute the pepper for other flavourings like fresh rosemary, thyme, grated parmesan, or seeds such as cumin, fennel, or sesame.