Here's the answer:
“好香啊!”
(hǎo xiāng ā!)
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 92% of the time!
(hǎo xiāng ā!)
Fun fact: the hundreds of thousands of people learning Chinese with Memrise get this phrase correct 92% of the time!