I start by heating my oven to 350°F (175°C) so it's fully ready by the time my dough is done. Then I toss the grated cheddar, softened butter, whole wheat flour, onion powder, and salt straight into the food processor. I run it for about two minutes, and it looks crumbly at first before suddenly clumping into a soft ball of dough.
Once the dough forms, I either roll it right away between two sheets of parchment or pop it in the fridge for 30 minutes if it feels too soft to handle. Chilling makes a noticeable difference on humid days. I roll the dough to about an eighth of an inch thick, since thinner dough always bakes up crispier and more even.
Using a pizza cutter, I slice the dough into small squares, though a cookie cutter works just as well if you want a whole wheat goldfish crackers recipe look for the kids. After cutting, I poke a tiny hole in the center of each one with a skewer. This little trick stops them from puffing into odd bubbles in the oven.
I transfer the cut crackers onto a parchment-lined baking sheet, leaving a little space between each one since they do spread slightly. This is also the moment I sprinkle on a bit of extra salt if I'm in the mood for something closer to a store-bought cracker.
Baking time really depends on the size of your shapes. My small squares usually take 8 to 10 minutes, while bigger cutout shapes can take up to 13 minutes. I watch for the edges just starting to turn golden brown, then I pull the tray immediately since they go from perfect to overdone fast.
I let the crackers sit on the baking sheet for a few minutes before moving them to a wire rack. They crisp up even more as they cool, so resist the urge to taste-test the whole tray right away (easier said than done, I know).