Final answer:
To correct the punctuation errors, add commas after 'fillings', semicolons after 'Cuban black beans' and 'portobello mushrooms, and no colon is needed.
Step-by-step explanation:
To correct the punctuation errors in the given text, you need to add commas, semicolons, and colons in appropriate places. Here is the corrected version of the text:
Mr. Olson makes stuffed peppers with a variety of fillings, such as Cuban black beans; portobello mushrooms, which he first sautés; and even scrambled eggs.
By adding a comma after 'fillings' and using a semicolon after 'Cuban black beans' and 'portobello mushrooms', we separate the fillings and clarify how the different elements are related to the statement. Additionally, the use of commas within the phrases 'Cuban black beans' and 'portobello mushrooms' remains unchanged as they are essential information within each phrase. Finally, a colon is not needed in this sentence as the list is introduced by the phrase 'such as' without any prior independent clause before it.