5h 30m layover in Amersterdam - suggestions?

I had a 6 hour layover before flying to Spain. I tried getting from Schipol into Amsterdam but too damn confusing so I stayed in the airport. I don't know if is worth it but I wish you better luck than I had. And I was traveling single with only a carry on bag.

They open at 9 am so you should make yourself the first in line for the 9 am showing
If you try this get tickets online 2 or3 months in advance as they sell out.
Read the details from the official site

http://www.annefrank.org/en/Museum/Practical-information/Online-ticket-sales/

You have to take a taxi to get there and back on time
You are pushing it Anne Frank House is a 1 hour visit at least and packed narrow perpendicular with lots of stairs.
You won't be able to easily go through it

I don't think you have time to visit.

I think you might want to stay at the airport. Definitely not enough time to get into the city and back to catch your flight.

It is a sucker play. You don't have enough time. Enjoy the airport. At least it is one of the better airport to kill time.

I differ with the comment about transport being confusing....there are plenty of options and they're very straightforward, couldn't be easier.
https://www.schiphol.nl/en/travel-from-schiphol/

You didn't say when exactly you'll be landing. I would play by ear. If you get out of customs quickly, then decide whether you want to go into town. I saw services in the airport that even provide easy transport to the flower gardens, so getting to Anne Frank's House shouldn't be difficult. But be realistic about how much time you really have to spend in Amsterdam...if you don't have enough time, then just let it be and enjoy the airport. As far as airports go, Schipol is very user-friendly. If you're tight on time and still want to leave the airport, then you have to plan very well (prior to your trip) so everything goes off without a hitch.

Figure 1.5 hours to get out of the airport and into town. Figure another 1.5 hours to get from town back to the airport and through security. That would leave you 2-3 hours in the city. Amsterdam is great, but the hassle and expense isn't worth it just for a couple of hours in the city.

Keukenoff is only open March - May

The problem with the Anne Frank house is that even if you sailed through Customs and had plenty of time, unless you had a timed entry reservation, you'd just spend your time in Amsterdam waiting in line to get in. And you probably wouldn't want to reserve a timed entry if you weren't sure you could get there.

The area around Amsterdam Central station has some sights; if you did exceptionally well going through Customs you could take the train from the airport to town, wander around a little, and then go back. But as others have said, it's a nice enough airport, and it might be smarter to stay there.