Final answer:
The verb in the sentence 'T'Challa taught me many random facts about mashed potatoes' is 'taught'.
Step-by-step explanation:
The verb in the sentence 'T'Challa taught me many random facts about mashed potatoes' is taught. The verb 'taught' is the past tense of the verb 'teach'. It is used to indicate that T'Challa educated or instructed the speaker (me) about various random facts related to mashed potatoes.