Add the potatoes to a large pot and cover with water. Season generously with salt. Place over medium-high heat and bring to a boil. Cook until tender, 8 to 10 minutes. Drain and set aside to cool, 5 to 7 minutes.
Preheat a grill pan over medium-high heat. Toss the cooled potatoes with the olive oil, rosemary, garlic, onion and red bell pepper. Place on the grill pan and cook until nicely browned, 2 to 3 minutes per side. Remove to a large bowl.
Make the dressing by adding the mayonnaise, sour cream, buttermilk, parsley, dill, chives, Worcestershire sauce, vinegar, hot sauce and some salt and pepper to a mason jar. Secure the lid and shake until well combined.
Pour the dressing over the potatoes and toss to coat. Fold in the chopped bacon, sprinkle over the scallions and serve.
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