Hydrate the flakes: Place the chipotle flakes in a small bowl and pour the hot water over them. Let them steep for 5 minutes.
Build the sauce: Add the ketchup (or tomato paste), vinegar, garlic powder, onion powder, cumin, oregano, and salt directly into the bowl with the flakes and water.
Meld the flavors: Stir vigorously until it forms a thick paste. If you have the time, let it sit for another 10 minutes before using it.