Question

add or remove commas, if necessary, until the sentence has correct punctuation. edna krabappels pie, completely burnt to a crisp, was mistaken for chocolate cake at the bake sale.

Explanation:

The commas are used correctly. "completely burnt to a crisp" is a non - essential clause providing extra information about the pie, and commas are properly used to set it off.

Answer:

Edna Krabappel's pie, completely burnt to a crisp, was mistaken for chocolate cake at the bake sale.