O2 Valley

San Mateo, CA · Taiwanese restaurant

Rating
4.7/5
★★★★★ 4.7
Reviews
16
Rank in San Mateo
#46
of 340 restaurants
City Percentile
84%
rating percentile
Address
O2 Valley, 41 E 4th Ave, San Mateo, CA 94401
Phone
(650) 653-1333
Website
order.o2-valley.com/san-mateo/menu
Status
Closed · Opens 11 AM

O2 Valley is a restaurant located in San Mateo, CA. It is one of 340 restaurants listed in San Mateo. Its 4.7-star rating is above the San Mateo city average of 4.3 stars. There are 10 photos associated with this location.

About O2 Valley

Taiwanese bento and boba drinks

Hours

Saturday11 AM–9 PM
Sunday11 AM–9 PM
Monday11 AM–9 PM
Tuesday11 AM–9 PM
Wednesday11 AM–9 PM
Thursday11 AM–9 PM
Friday11 AM–9 PM

Customer Reviews

★★★★★ 5.0 Anna Ng · Mar 2026

This is a Taiwanese bento box spot~ They give a generous portion which I was suprise to see! I ordered the basil popcorn chicken, grilled chicken cutlet bento, and the Taiwanese sausage bento. - The popcorn chicken was soo good!! Nice and crispy. The chicken was juicy and was cut very big. - I was slightly disappointed in the grilled chicken cutlet bento, I misunderstood what I was getting and thought it was a grilled chicken. I wasn’t expecting it to be fried. The bento box also came with a cucumber & egg dish, napa cabbage, tea egg, and some minced pork on the rice. I thought the cucumber and Napa cabbage dish were very light in taste, almost bland, but it helped balance the grilled chicken cutlet.

★★★★★ 5.0 David Yao · Jan 2026

Guess how many pieces of fried pork chop were in their plate? FOUR. F. O. U. R. For $17? In THIS *gestures wildly around* economy?! The pork chops are sweet, savory, and perfectly crunchy with that nice, Taiwanese street food spice on top. A little sweeter than I’m used to, but I’m on board. And their rice, my litmus for how seriously a place takes its food, are very well separated, chewy, and moist without being soggy (even after a long car ride home). The veggies? Just like how my popo made em. The fried mushrooms are the sleeper appetizer. Large chunks of king oyster mushroom battered and fried with a shatteringly crisp crust. Their soy garlic paste sauce is addicting and I’d eat it with anything. They’re still new so give em some grace, but I got my order in 15 minutes from orderin

★★★★★ 5.0 Toby Mao · Feb 2026

I love their bentos. I think I went every day last week, trying something new every time! There’s so much variety and everything tastes great. My only complaint is that it’s pricey at $17-$18 per bento but I guess this is just an industry trend and not unique here. Definitely the best Taiwanese bento in the Bay.

★★★★★ 5.0 Manzana5688 · Jan 2026

I’m so happy that opening the new one in the San Mateo location which is close to me. The quality is good as in other locations. I was here on the second day of opening. The cute lady at the front desk is so nice and friendly with other employees. Highly recommend this if you'd like to try a traditional Taiwanese bento.

★★★★☆ 4.0 Dharma M · Feb 2026

I've visited their Palo Alto location before, so I was excited to see this new spot open up. This location is a bit smaller than the one in Palo Alto, but it's a great addition to the neighborhood. ​The interior is simple. They have two touch screens for ordering, which makes the process incredibly simple and clear. While there is some seating and a standing area if you want to eat in, I noticed that most people (myself included) tend to order to go. ​I ordered the Basil Popcorn Chicken, and it did not disappoint: ​Texture: Perfectly tender and juicy. ​Flavor: Really yummy and well-seasoned. ​Quality: Even after the walk/drive home, it stayed nice and delicious while warm. ​Verdict: A solid, efficient spot for a quick snack or meal. I'll definitely be back to grab more chicken and order ot

Accessibility & Amenities

✓ Delivery ✓ Takeout ✓ Dine In ✓ Lunch ✓ Dinner ✓ Solo Dining ✓ Wheelchair Accessible Entrance ✓ Wheelchair Accessible Parking Lot ✓ Catering ✓ Counter Service ✓ Seating ✓ Casual ✓ Family Friendly ✓ Credit Cards ✓ Debit Cards ✓ Good For Kids

Services

Taiwanese restaurantAsian restaurantBubble tea storeSeafood restaurantTempura donburi restaurant

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This listing is informational. Contact the business directly to verify credentials, services, and availability.