For the first plate, we have 5 possible snacks.
For the second plate, we have 4 possible snacks.
To find all possible combinations of snacks, multiply the number of possible snacks from the first plate by the number of possible snacks from the second plate:
5 (from the first plate) * 4 * 3 (from the second plate) = 60
So, Emma will have 60 possible snack combinations.