are the nouns in the following sentence, toppings, pepperoni, Italian, sausage, black, olives, green, peppers, onions, mushrooms or would I leave out the colors (I think they're adjectives)

She always ordered extra toppings, like pepperoni, Italian sausage, black olives, green peppers, onions and mushrooms.

In that sentence, Italian, black, green are all adjectives. Remove those, and you have identified the nouns correctly.

=)

In the given sentence, the nouns are "toppings," "pepperoni," "Italian sausage," "olives," "peppers," "onions," and "mushrooms." The words "black" and "green" are indeed adjectives used to describe the type or color of the olives and peppers respectively. Therefore, if you are specifically looking for the nouns, you would leave out the colors as they are just describing words (adjectives).