Place a large, heavy-bottomed pot over medium-high heat with 2 turns of the pan of EVOO, about 2 tablespoons. Add the chopped bacon and cook until crisp, about 2-3 minutes. Remove the bacon from the pot and reserve on a paper towel-lined plate.
While the bacon is cooking, remove the chicken pieces from the marinade and pat dry. Season thoroughly with salt and pepper and dredge in flour to coat. Shake off any excess and reserve.
Working with about 4 pieces at a time, place the flour-coated chicken pieces in the hot bacon fat and brown on both sides. Remove and reserve browned pieces on a plate, adding more EVOO if necessary to cook the rest of the pieces. If the bottom of the pan is getting super black, remove from the heat and wipe it out completely. Return to heat with 2 turns of the pan of EVOO. Once hot, carry on browning up the chicken.
Once all the chicken has been browned, add the reserved veggies and wine mixture to the pot along with the prunes. Bring up to a bubble, nestle the chicken down into the liquid and bring back up to a bubble. Place a lid on the pot and turn the heat down to medium and cook for about an hour to an hour and a half, depending on the size of the chicken pieces.
If using fresh onions, bring about 5 cups of water to a boil in a medium-size sauce pot and season with salt. Once the water has come up to a boil, drop in the pearl onions. Cook until tender, 3-4 minutes. Once tender, dunk them into a large bowl of ice water to cool and then peel the outer skin and reserve.
To braise the onions, place a high-sided skillet over medium-low heat with 1/2 cup of water, sugar, butter and some salt and freshly ground black pepper. Add the onions and cook until lightly caramelized and slightly glazed, about 6-7 minutes.
To serve, divide the chicken and the sauce between 6 serving bowls. Arrange a couple of chunks of the bread down along the sides of the bowl, making sure the bread dips into the sauce a little bit. Top each bowl with some of the braised onions and some chopped parsley.