Preheat the oven to 350 degrees F.
Cook the bacon in a nonstick skillet over medium heat, stirring occasionally, until crisp, about 8 minutes. Transfer to a paper towel-lined plate with a slotted spoon. Reserve 1 tablespoon of the drippings.
Mix together the cream cheese, Cheddar, sour cream, milk, vinegar, jalapenos, bacon and reserved drippings in a medium bowl. Spread the mixture in a baking dish and bake until golden and bubbly, about 30 minutes. Sprinkle with the scallions before serving.
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