To a large 18 x 26-inch baking sheet, add your prepared broccoli and potatoes. Add the olive oil, salt, and pepper, and toss to coat. If you're adding any optional toppings, add them now, too. Then, spread the vegetables out in a single layer.
2 tablespoons extra-virgin olive oil, ½ teaspoon salt, ½ teaspoon black pepper, 2 cloves garlic, ½ teaspoon Old Bay Seasoning, ½ teaspoon garlic or onion powder, ¼ teaspoon crushed red pepper flakes, ½ ounce chopped fresh herbs, 2 tablespoons grated Parmesan cheese