Crumbs

Name: Crumbs Bake Shop

Neighborhood: Loop

Address: 134 N LaSalle Street

Map (link above): red dotted markers

Nearest El Transit Locations: 

Clark/Lake station Blue, Brown, Green, Orange, Pink, Purple lines

Washington Blue line

Washington/Wells Brown, Orange, Pink, Purple lines

Hours: 

Mon - Fri 7am - 7pm

Other Chicago Locations:

West Madison, 303 W Madison

River North, 346 N Clark

South Clark, 42 S Clark

Bake On-Site: No (have a distribution center in Chicagoland area)

Individual Cupcake Prices: $4.50 ("Signature" size) and $3 ("Classic" size)

Boxing/Packaging: Fitted Clam Shell
What makes this bakery special:

They have two cupcake sizes available for single purchase: Signature (all varieties available) and Classic (chocolate and vanilla). Their Signature size cupcakes are huge, and famous for it.

Cupcakes Purchased and Reviewed: 

Milkshake Cupcake

Cake: Marble (Chocolate and Vanilla Swirl)

with Chocolate and Vanilla Swirled Cream Cheese and Cream Cheese Filling

Appearance: 3

Size: X-Large

Vanilla/Vanilla (right) and Milkshake cupcake (left)

Bite #: 7

Moisture: 3
Price: $4.50 (Signature)

Vanilla/Vanilla
Cake: Vanilla
with Vanilla Cream Cheese
Appearance: 1
Size: X-Large
Bite #: 7
Moisture: 2
Price: $4.50 (Signature)

Additional Notes:
These cupcakes are huge! I mean like solid cake-y softballs. For some, that may be something attractive of Crumbs, but personally I like to enjoy my cupcakes as a snack or dessert, in one sitting, instead of as a meal themselves.
The cream cheese filling of the Milkshake cupcake was strange and unexpected with an almost banana or malty flavor to it. The cake was rich and super moist,  and the vanilla swirl portion complimented the chocolate swirl portion in harmony.
The vanilla cupcake was moist, but seemed dry to the taste. The frosting was grainy (I mean, it's just sugar granules) and left a unique coating in my mouth. Overall, I liked the vanilla in the Milkshake marble cake much better.
The frosting-to-cake ratio was smaller than expected for such a large cupcake (which in my case was kind of nice because I prefer a small amount of frosting with cake anyway).
Cupcake selection is very diverse.
Quick service.
Set up for a quick drop in or you can eat at one of the many sizable indoor tables.