Add the olive oil to a large non-stick skillet, along with the sliced onions and about 1/4 teaspoon of sea salt. Heat over medium-high and saute, stirring occasionally, until onions begin to sweat and begin turning translucent, about 5 minutes.

Reduce the heat to medium and continue sauteeing, stirring occasionally, until onions begin to brown, about 15 minutes. Reduce heat to medium-low and continue cooking, stirring occasionally, until onions are deeply browned and caramelized, about 25 to 30 minutes more. Note: If onions begin to stick to the pan at any point, you can de-glaze with a few tablespoons of water (or beer or wine).

Boil the potatoes until tender but still al dente, about 10 to 15 minutes. Drain and place potatoes on a cutting board to cool. When cool enough to handle, chop the potatoes into bite sizes (Note: You can easily remove the potato skins if you'd like, or you can leave them on) and transfer them to a mixing (or serving) bowl. Add the caramelized onions to the mixing bowl with the potatoes.

Cook the bacon over medium-high heat, turning until crispy, about 3 to 5 minutes. Remove skillet from heat, and use tongs to place bacon on a cutting board, leaving the drippings in the skillet. Chop the bacon and add it to the bowl with the potatoes.

Leaving the skillet off the heat, add the garlic and allow it to cook for 1 to 2 minutes in the hot drippings. Add the cider vinegar and stone ground mustard and whisk to combine. Pour this mixture over the potatoes, bacon, and caramelized onions. Sprinkle in the salt and toss everything well to combine. Note: The dressing will pool up a bit at the bottom of the bowl, so continue stirring until the potatoes soak up all of the liquid. Add the chopped chives and stir well. Taste the potato salad for flavor. Add sea salt to taste.

Serve alongside your favorite entree.