Preheat oven to 375º. If you're starting with whole Brussels sprouts, trim the stems and remove any tough outer leaves. Using a sharp knife slice them thinly. If you prefer a shortcut, opt for pre-shaved Brussels sprouts available at some grocery stores.
On a cooking sheet, combine the shaved Brussels sprouts 1 tsp oil, salt, pepper, and garlic powder. Mix well and roast in the oven for 12-14 minutes, tossing often to ensure an even cook. Meanwhile, add chopped apple, cranberries, almonds, red onion and cheese to a large salad bowl.
In a small bowl, whisk together the Dijon mustard, apple cider vinegar, honey, water, salt, and pepper. This dressing ties all the components together with a harmonious balance of tang and sweetness. Taste the dressing as you go, you may want more honey or syrup to sweeten it up. Once the Brussels sprouts are tender, add them to the large bowl, pour the dressing over everything and enjoy.