Whisk the vinegar, oil, garlic, and syrup together in a large bowl. Add the brussels sprouts and apples and toss until coated. Line a baking sheet with parchment paper.
Spread the mixture out on the baking sheet. Bake in a preheated oven at 400 degrees for 20-30 minutes Baking time depends on how you cut your brussels sprouts: sliced take less time. Consider adding walnuts or dried cranberries for the holidays.
