Kauffman Stadium is a venue in or near Kansas City that is most often used for Baseball
The only restaurants that are close to Kauffman Stadium are Denny's, Taco Bell, and Subway. Fans may decide instead to tailgate and grill food of their own choosing. Not only will this be cheaper but you will get to participate in a tradition very unique to Kauffman Stadium due to its larger than normal parking area.
A lot of fans tailgate before games because there isn't much to get around the stadium unless you want fast food. Inside the stadium they have good food so I would just wait there or eat at some of the good restaurants closer to downtown Kansas City.