In a large skillet, cook the smoked bacon on medium heat until fat has rendered, and bacon is crispy.
Wash the Brussels sprouts, trim a bit off the bottom (which usually gets dry), cut them in half, and place them in a large bowl. Drizzle with one tablespoon of olive oil, oregano, chili powder, and season with salt and pepper.
Remove the bacon from the pan and add the Brussels sprouts on high heat, cooking them on the flat side first. Cook for four to five minutes, check for a nice golden-brown color then toss them around the pan. Add the chicken stock and scrape the bottom of the pan to get all the flavors from the caramelization. Cook for five more minutes. When checking for doneness, you want the Brussels sprouts to be soft on the outside, but still crunchy in the middle.
In a separate bowl, mix the maple syrup, soy sauce, and apple cider vinegar, and then toss in the Brussels sprouts.
Put the pecans in a zip-lock bag and lightly crush. Roughly chop the bacon. Slice the cheese with a vegetable peeler.
Serve the Brussels sprouts in a large bowl topped with bacon, crushed nuts, and shaved Pecorino cheese.