no you can't and you can't use other dining discounts either (which sucks since it's just food).
The desserts that are offered are:
cookies
brownies
fresh fruit
donut holes
little chocolate ball things
2 varieties of tarts with fruit on top
chocolate covered strawberries
mango shooters (many people like them, I thought they were disgusting so don't take a big taste if you don't know if you like them)
vanilla mousse cups
chocolate mousse cups
a couple other little chocolate desserts in cups
creme brulee
key lime tarts
there were a few other things but I didn't try everything. You can get full very quickly. If they run out of something you want just ask them for more. They will bring more out to you and put more on the buffet too.
There is also coffee, tea, milk, hot chocolate, juices, water, ice tea (sweet and non).
There is also a photopass person there to take castle pics with you and your family.