Set out a medium mixing bowl. Add the sour cream, mayonnaise, buttermilk, apple cider vinegar, salt, pepper, and garlic powder. Stir well. Then mix in the crumbled blue cheese. Cover and chill until ready to use. (If possible, make a day ahead, or early in the day, so the blue cheese has time to permeate the dressing.)
Cook the Bacon: Set a skillet over medium heat. Place the chopped bacon in the skillet. Brown the bacon for 4-6 minutes until crispy, stirring regularly. Then scoop the bacon out of the skillet onto a paper towel lined plate to drain off the grease.
Prep the Veggies:
Slice the tomatoes in half and chop the scallions. Then set the head of lettuce on the cutting board. Trim the root/core end a little. Cut the head in half, through the core. (This helps hold the wedges together.) Then cut each half in two, through the core.
Stack the Wedges:
Set each lettuce wedge on a plate. Drizzle with a generous amount of blue cheese dressing. (At least ¼ cup per salad.) Then sprinkle the tops with halved tomatoes, scallions, bacon, and more blue cheese crumbles. Finish each salad plate off with a bit of fresh cracked pepper. Serve cold.
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Notes
For best results make the dressing a day ahead, so it has a strong blue cheese flavor.Homemade blue cheese dressing will keep well in the fridge for up to one week.