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Chiefeater chiefeater.com
OO White Coffee Cafe was recommended by Chiefeater Hedges Liang. A must visit and also Teh saying you got to try the beefy. So, absolutely a MUST VISIT.
K 
Kenhuntfood kenhuntfood.com
If you happen to tour around Penang island (or a local here), chances are high that you have seen or tried this brand- OO White Coffee Cafe 噢噢白咖啡.
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Sengkangbabies sengkangbabies.com
Oo White Coffee Cafe scored 5/5 for us too.
The coffee, toast bread and the Loo beef noodles (nested inside Oo)!