Add whole wheat flour and all purpose flour in a bowl along with the salt and oil. Bring everything together with a little water.
Knead this into a slightly tough dough. Cover and let it rest for 30 minutes. Meanwhile, preheat the oven to 350°F.
Portion the dough and roll it out into a very thin sheet on a lightly greased surface.
Transfer to a parchment paper-lined baking sheet and brush with some more oil.
Generously sprinkle the everything bagel seasoning all over the rolled dough.
Bake for 15-20 minutes, or more if the crackers still don't have that light golden brown color.
Remove and allow it to cool down completely. Use your hands to roughly break into small crackers.
Notes
Use a combination of whole wheat and all-purpose flour for crackers with a slightly nutty flavor and crisp texture.
Add water gradually while kneading until the dough is firm but pliable. Avoid adding too much water, as this can make the dough sticky.
Let the dough rest, covered, for 30 minutes to make it easier to roll into thin sheets.
Roll the dough as thinly and evenly as possible for crispy crackers. Thicker portions may remain soft after baking.
Brush the rolled dough lightly with oil before sprinkling the everything bagel seasoning to help it stick.
Check the crackers after 15 minutes of baking, as thinner edges may brown faster than the center.
Allow the baked sheets to cool completely before breaking them into crackers, as they will become crispier as they cool.
Store cooled crackers in an airtight container at room temperature. If they lose their crunch, reheat briefly in the oven and allow them to cool before serving.