They don't offer muffins on menu, just the Master's Cupcake. Coffee or cupcake should be a snack credit each. If you are referring to photos of plate of muffin/pastry - that is included with entrees. If you order an entree you will get pastry and drink for a QS credit.
Personally if you just want to see inside....
I would order a coffee, pay cash, fill it up, walk around and enjoy, then leave. Not waste any snack credits.
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