The place I've seen info was on the Know Before you Go information sheet. It doesn't specifically state the offerings of each category though.
"FOOD & BEVERAGE
The event credential will include four (4) coupon tabs. Each credential coupon is valid for one (1) food or beverage item under the applicable category, excludes novelty items. Categories are as follows: Graveyard Snacks, Haunted Hors d’oeuvres, Ravenous Desserts and Tempting Beverages. These credential coupons are valid on the respective event date and time only at
Disneyland® Park. Credential with attached coupon must be presented at participating food & beverage event locations which will be indicated in the Event Guide Map to receive select food or beverage items in exchange for the coupons. Coupons must be attached to the credential at time of redemption and surrendered to a Cast Member at time of use; void if detached.
Things to Note:
• In addition to the entitlements, limited-time menu items have materialized for purchase at select locations.
• Limited Vegetarian menu offerings are available at select locations.
• Kosher available at select locations upon request."