Add to the dry ingredients and stir until well mixed making sure the dry ingredients are soaked and there’s no pockets of flour.
Pour batter evenly into the prepared loaf pans and transfer to the preheated oven. Bake for 50 to 60 minutes or until a cake tester inserted in the center comes out clean, switching the front pans with the back pans halfway through cooking.
Remove from the heat and let them cool for 15 minutes before unmolding and transfer the loaves onto a wire rack; allow to cool completely.
Wrap loaves individually in foil and transfer to the fridge overnight.
The next day, move them to the freezer for 2 hours.
Preheat oven to 250ºF and line large baking sheets with wire racks; set aside.
Using a serrated knife, slice loaves as thinly as possible (about 1/8-inch thick) and lay the slices in a single layer on the prepared baking sheets.
Transfer them to the preheated oven and bake for 1 hour. Halfway through cooking, take the sheets out and flip the crackers. Return the sheets back to the oven but switch them - the one that was at the bottom rack goes to the top and vice versa.
When time is up, let them cool completely before storing in airtight containers for up to 2 weeks or freeze them for up to 2 months. Yields between 88 to 100 crackers.
Notes
Footnote: You can use all bread flour and omit the whole wheat.