Review the item:
Instead of syrup, Jeremiah likes to put peanut butter on his
pancakes,
the smell is appealing, but I would not want to eat anything so sticky
that early in the morning.
For a sentence to be fused, you must have two complete sentences run together with no punctuation. In the example above, a comma joins the two sentences. Jeremiah likes to put peanut butter on his pancakes is one sentence. The smell is appealing is the second sentence.
Thus, the error is a comma splice.
To fix the problem above, you could put a period after pancakes and capitalize the T in the.