Some onion powders and jarred products include dual-sifter or combined sprinkler-and-spoon dispensers for easy use. Packeted mixes are described as safety-sealed to preserve flavor.
Common companions include garlic, black pepper, basil, parsley, rosemary, sesame or poppy seeds, cayenne, dry mustard, and cumin; some blends also list sea salt.
Dressing packets instruct mixing the packet with vinegar, water, and oil (each packet makes about 8 fl. oz.). Instant soup/dip envelopes direct mixing one envelope with 4 cups of water, bringing to a boil, then simmering for about 5 minutes.
They are sold as pre-sliced, flash-frozen pieces described as skillet-ready. The bag notes they are fully cooked/heat-and-serve and typically heat through in about seven minutes.