In a 3- or 4-qt. slow cooker, combine the first eight ingredients. In a small bowl, whisk honey, water, oil, cinnamon, vanilla, nutmeg and salt until blended; stir into oat mixture. Cook, covered, on high until crisp, 1-1/2 to 2 hours, stirring well every 20 minutes.
Stir in cranberries and raisins. Spread evenly onto waxed paper or baking sheets; cool completely. Store in airtight containers. If desired, serve with yogurt.