Add all of the dressing ingredients to a medium bowl and whisk until well combined. Add milk to reach desired consistency. Best if chilled at least 30 minutes. Can be made days in advance and refrigerated in an airtight container.
Balsamic Reduction
Note: Make just before serving or Reduction will thicken too much.
Add 1/2 cup balsamic vinegar and 2 tablespoons brown sugar to a small saucepan. Bring to a boil then reduce to a simmer just until the consistency of syrup (it will thicken upon standing). Remove from heat. If Reduction thickens before you use it, then stir in a little water and reheat in the pan.
Serve
Add wedges to individual plates and top with desired amount of Blue Cheese Ranch followed by tomatoes, onions, corn and bacon. Drizzle with balsamic reduction. Garnish with additional blue cheese if desired.