Which of the following is NOT a promotional menu item mentioned?

Onion Rings is the correct answer because it is not specified as a promotional menu item in the context of this question. Promotional items typically refer to special products that the establishment is highlighting for a limited time or at a special price to attract customers. Fried Oreos, the $2.99 Quarter Pound Double Cheeseburger, and the Slinger and tots deal are examples of specific menu items that could be featured in promotions, often designed to create buzz or draw attention to the menu during certain campaigns. In contrast, Onion Rings are generally a standard menu offering rather than a special promotion, which sets them apart from the other options listed.