The best way for the person to describe the ingredients, based on clarity and alignment with the recipe, would be:
"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."
This response accurately lists the required ingredients and notes that vanilla and honey are optional, while also suggesting specific types of toppings (berries and nuts), making it informative and clear.