Try this place if you are near. https://goo.gl/maps/ed7k4TeFfqgGARVZ7
Tawii Sourdough Cafe หมู่ที่ 1 170/92 San Pa Pao, San Sai District, Chiang Mai 50210
Very good bread, coffee and croissants too. Super nice people. A little hard to find the first time