To a large 18 x 26-inch baking sheet, add your prepared potatoes and asparagus. 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 olive oil, ¼ teaspoon salt, ¼ teaspoon black pepper, 2 cloves garlic, 3 sprigs chopped fresh rosemary, thyme, or oregano, ½ teaspoon garlic or onion powder, ¼ teaspoon crushed red pepper flakes, 2 tablespoons Parmesan cheese or nutritional yeast