Well, one of the most frequented places that I go to, whenever I am at my Megah office, and I need my dosage of cake and coffee - would be La Manila Cafe. Truthfully, their cakes are pretty alright, coffee is not bad. There are not many good ones in Taman Megah, so they would fall amongst the better ones in Megah already.
They have their tea time and lunch time combos too - so feel free to check it out if you are around the area!
24 Jalan SS24/13,