In a large bowl, combine the brussels sprouts, sweet potatoes, maple syrup, oil, garlic, salt and pepper.
2 pounds brussels sprouts, 1 ½ pounds sweet potatoes, 3 tablespoons pure maple syrup, 2 tablespoons avocado oil, 3 to 4 small garlic cloves, 1 teaspoon salt, ⅛ teaspoon ground black pepper