Urban Cookies is a cute little pastry shop on 7th street just south of Camelback. I've tried most of their standard cupcake flavors and my favorites are probably the peanut butter chocolate and the strawberry. They're also pretty famous for their take on a red velvet cupcake--while I'm personally kind of "meh" on cream cheese frosting in general, I have several friends who are OBSESSED with their Brown Velvet cupcakes. However I would say Urban Cookies is especially worth checking out for their seasonal/holiday cupcakes: some of the flavors I've had in the past are margarita, Mexican chocolate, Irish cream, or S'mores. While I haven't tried most of their cookies (because of a walnut allergy), their double chocolate sea salt cookie is super tasty.
Sign up for their rewards program in store, and you'll occasionally be texted with a BOGO offer for cupcakes or cookies. They also do a "happy hour" on Sunday and Monday afternoons with 50% off cookies & cupcakes - check the website or their fb page for hours.