In a bowl, combine wheat flour, white flour, garlic powder, and salt.
Add olive oil and sourdough discard, and mix well. Last add in the grated parmesan cheese and knead until well combined.
Shape into disc, wrap in plastic wrap, and let rest 20-30 minutes. Preheat oven to 350ºF. Prepare baking sheet(s) with parchment paper.
Divide dough into 4 portions. Roll one portion thinly, 1-2 mm thick, about the thickness of a penny. Sprinkle ½ Tablespoon Everything Bagel seasoning over dough evenly and roll over with rolling pin to press into dough. Repeat with other sections of dough.
Cut into small squares (about 1 inch) with pizza cutter or ravioli cutter, and transfer to baking sheet(s) using spatula, so edges of crackers do not touch.
Bake for 12-15 minutes, depending on thickness. Crackers should be barely golden. Brown crackers are overdone.