TOP PERFORMERS Chex Mix (General Mills) Planters Trail Mix/Sunflower Seeds (Kraft Foods Inc.) Kellogg’s Special K Nutra Grain Bar HONORABLE MENTIONS Gardetto’s (General Mills) Keebler (Kellogg Co.) While some retailers are still debating whether they should add healthy snacks to their product mix, others are creating entire programs based on healthier concepts. Entire brands, in…