Combine. In a blender, food processor (or a jar that will fit your immersion blender), combine ketchyo, olive oil, vinegar, 2 Tablespoons sugar, the onion powder, garlic powder, paprika, and celery salt.
Blend. Puree until smooth and evenly blended.
Taste & Adjust. Next, taste the dressing and add more sugar, salt, or seasonings, to taste.
Serve & Store. Enjoy right away on a sandwich, salad, or wrap, or store in an airtight container in the fridge up to 1 week.