Combine the marinade: To a large container with a tightly fitting lid or a gallon-sized sealable bag, add the lighter oil, extra virgin olive oil, nutritional yeast, garlic powder, onion powder, crushed red pepper flakes, smoked paprika, mustard powder, sugar, black pepper, and salt. Stir well to combine. At this point, you can spoon a bit of the seasoned oil onto a saltine and taste it. If you’ve started with a smaller amount of red pepper flakes, this is a good time to try it and see if you can handle the full 2 tablespoons. It’s also a good time to taste for salt and add another pinch if you’d like
Add the crackers and marinate: When you’re happy with the marinade, carefully add 2 sleeves of saltines. (Don’t worry if any pieces break though, those are a treat for the chef!) Seal the container and toss it around gently. Flip it upside down and leave it for a bit, and then continue to gently move the container around, rotating it around all angles until the crackers are fairly evenly coated. At this point, you can speed up the marinating process by doing a toss with your hands. Simply do a few gentle tosses with your fingers, and if you’d like to be extra thorough, you can rub the spiced oil over each cracker. Then let the crackers sit overnight, or as long as you can, tossing and turning the container every few hours if you can.
Bake the firecrackers: When ready to bake, preheat your oven to 250° F (121°C) and line 2 large baking sheets with parchment. Technically this step is optional, as the crackers already taste great once they’re marinated, but a quick toast takes them to the next level! Simply line up the crackers on the baking sheets, leaving a bit of room between them, and gently rubbing any remaining marinade on the crackers as you go. Once they’re all lined up, place in the oven and bake for 15 minutes, then if you have the time, flip the crackers and return them to the oven, switching the position of the two trays. Bake for an additional 10 minutes, or until fragrant and toasty. Remove from the oven and let cool before serving or storing in an air-tight container.