The noun (Substantiv/Nomen) Zutaten is feminine in German. Therefore, the correct definite article in the nominative singular is die. So, you say: die Zutaten.
(ingredients)
Bestandteile eines Gerichts oder Produkts.
Components of a dish or product.
Welche Zutaten brauchst du für den Kuchen?
What ingredients do you need for the cake?