Gather all your ingredients and the equipment needed for the Chicago Mild Sauce recipe.
First, grab your medium-sized saucepan and pour in the ketchup, water, brown sugar, apple cider vinegar, and Worcestershire sauce.
Next, place the saucepan over a medium heat setting. Stir your mixture from time to time until it begins to gently bubble.
Now, it's time to introduce the rest of the spices: garlic powder, onion powder, smoked paprika, ground black pepper, and a dash of salt. Mix these ingredients thoroughly until they're fully incorporated.
Reduce the heat to low and let your Chicago Mild Sauce leisurely simmer for approximately 20-25 minutes. You'll notice the sauce begins to thicken slightly.
Finally, when the sauce has achieved your desired consistency, take it off the heat. Allow it to cool down to room temperature before decanting it into a glass jar or a similar storage container.