In a large pot
, heat the olive oil over high heat. Add the Brussels sprouts and cook, letting them sit for a bit in between stirs, so the outsides brown up nicely in spots, about 4 minutes. Reduce the heat to medium, add the garlic and saute until it colors slightly, about 1 minute. Stir in the red pepper flakes, and season with salt and pepper. Add the kale, you may have to do this in batches, letting it cook down a bit before you can add more. Stir in half of the bacon.