Trail mix is a tasty, high-energy snack; pack a few handfuls per person for the next picnic or walk in the woods.
Preheat oven to 375 degrees. Combine butter, maple syrup, almonds, wheat germ, oats, and salt in a large bowl. Spread mixture on a rimmed baking sheet lined with parchment paper.
Bake, stirring once and rotating sheet after 20 minutes, until just golden, 35 to 40 minutes total. Let cool on sheet on a wire rack. Transfer to a large bowl, and stir in bananas and cranberries.
Trail mix can be stored in an airtight container, up to 1 week.