Here is the item again:
Todd is an amazing cook,
he can look into a nearly empty refrigerator and put together an
interesting dinner; yesterday, for example, he made a sliced pickle and
mayonnaise sandwich, using an old blueberry muffin as bread.
The comma between cook and he creates a comma splice. At this spot, there are two main clauses joined with a comma alone, making a major error. Todd is an amazing cook is the first main clause. He can look into a nearly empty refrigerator ... begins the next main clause.
To fix this problem, you could put a period after cook and capitalize the H for he.