Here's the answer:
“太好吃了!”
(tài hǎo-chī le!)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
Fun fact: the hundreds of thousands of people learning Chinese with Memrise get this phrase correct 94.72% of the time!
(tài hǎo-chī le!)
Fun fact: the hundreds of thousands of people learning Chinese with Memrise get this phrase correct 94.72% of the time!