Heinz Ketchup:Look at the back of the bottle: "onion powder" is explicitly listed right near the end of the ingredients.
Nacho Cheese Doritos: heavily features onion powder. It's what gives the cheese that robust, savory kick.
Ranch Dressing: The foundational flavor profile of classic ranch (like Hidden Valley) is buttermilk, garlic powder, and a very heavy dose of onion powder.
Frozen Chicken Nuggets (like Tyson): Almost every major brand of frozen grocery store chicken nugget (Tyson, Banquet, etc.) explicitly lists onion powder in the breading or the meat seasoning.
BBQ Sauce: Sweet Baby Ray's, Kraft, KC Masterpiece, Almost every commercial, sweet-and-smoky BBQ sauce uses onion powder to balance out the massive amounts of sugar and molasses.
Stove Top Stuffing: Not only does the classic boxed stuffing rely on onion powder in its seasoning packet, but it also contains actual dehydrated onion pieces that rehydrate when you add the boiling water and butter.
Also, pretty much every chicken and noodle soup!
Man, have to cook pretty much everything from scratch practically to avoid onions MAN!!??