Get Chunky, originally located in Fremantle market but now residing in Mount Lawley, is hands down my favourite cheat day treat. Haling as Perth's first American-style dessert shop, they serve up massive, but most importantly, delicious cookies.
The cookies are purchasable either by themselves or in an ice-cream/cookie combo which costs a modest ten dollars. When you see the size and experience the taste of the cookies, you will understand why that is so modest!
The only possible downside to this store is its tiny interior and thus the lack of seating! The indoors seating consists of a single bar style bench that runs along the window front. Admittedly though, it does give the store a rather trendy, minimalist vibe. The outdoors seating is a lone garden bench.