Trim the ends of the Brussels sprouts and pull off any outer leaves that are brown/wilted. Then halve them lengthwise.
Place the sprouts on a baking sheet, drizzle with oil, sprinkle with salt, and toss to coat with your hands.
Roast for 15 minutes, then stir the sprouts to ensure even cooking. Return them to the oven and roast until they're golden brown all over, about 5 minutes more.
Meanwhile, in a small bowl, combine the mustard, maple syrup, vinegar, and hot sauce, and whisk to combine.
Take the sprouts out of the oven, drizzle with the glaze, and lightly toss to coat. Return them to the oven for another few minutes and roast until the glaze thickens.
Serve immediately, optionally garnished with chopped parsley.