The best way for the person to describe the ingredients is:
"Begin by gathering your ingredients. You need to have oats, milk, and yogurt, while vanilla and honey are optional. You will also need berries and nuts as toppings to make your oats even tastier."
Reasoning: This option clearly outlines the essential ingredients (oats, milk, and yogurt) while indicating that vanilla and honey are optional. Additionally, it suggests specific toppings (berries and nuts) to enhance the dish, making it practical and informative for someone following the recipe.