Final answer:
The recommended snack for a 2-year-old toddler according to MyPlate guidelines is 1 cup of yogurt, as it provides essential nutrients without high levels of fat or sugars.
Step-by-step explanation:
For the nutritional teaching of the guardians of a 2-year-old toddler, the recommended snack food to include in the toddler's diet would be 1 cup of yogurt. According to the MyPlate guidelines, a healthy snack should include nutrient-rich foods that provide calcium, protein, and essential vitamins without high levels of fat or added sugars. Yogurt is a good source of calcium, vitamin B2, protein, and vitamins A and D, and it fits into the Milk/Yogurt/Cheese Group of the MyPlate recommendations. It's a healthier alternative compared to fruit gel bites, which might contain added sugars; a hot dog, which is processed meat and may be a choking hazard; and a peanut butter and jelly sandwich, which can be more suitable for an older child and may have added sugars depending on the jelly used.