To make the dressing, add sour cream, garlic, two ounces of the blue cheese, and lemon juice to a small bowl. Use a fork to combine the ingredients, smashing the blue cheese crumbles against the side of the bowl to infuse the sour cream with flavor.
Add chives to dressing and stir to combine. Add milk a teaspoon at a time until the dressing reaches your desired consistency. Season dressing to taste with salt and freshly ground black pepper.
To Assemble Wedge Salad:
Remove any wilted or brown leaves from the head of lettuce.
Cut the head in half starting from the top and slicing down through the core. Then cut each half in half again so that each wedge has 1/4 of the core. Rinse each wedge and pat dry with paper towels. Carefully cut core from each keeping wedge intact and place on separate salad plates.
Spoon desired amount of dressing over each wedge. Sprinkle each wedge with 1/4 of the bacon crumbles and 1/4 of the remaining blue cheese. Serve.
Note that cook time doesn’t include bacon.
If you'd like to cook your bacon in the oven: Preheat oven to 400°F. Line a baking sheet with parchment paper and set an oven proof rack on top. Arrange bacon slices on the rack, giving them a bit of space between. Bake for 15 to 20 minutes or to your desired crispness. Remove from oven and set aside to cool.