Heat oven to 350 F.
Place the baguette slices on a large baking sheet and evenly drizzle them on both sides with 2 tablespoons of the olive oil. Bake for 8 minutes or until golden brown. Set aside.
In a large mixing bowl, combine the butternut squash, apples, kosher salt, black pepper, cinnamon and nutmeg. Add the remaining 1 tablespoon olive oil and, using a rubber spatula, mix to coat evenly.
Evenly spread the squash and apples on a large baking sheet and bake for 23 to 25 minutes until they are soft and golden brown. Return them to the large bowl.
In a small bowl, whisk together the cottage cheese and dried sage until well combined. Season with kosher salt and freshly ground black pepper.
Evenly spread about ½ tablespoon of seasoned cottage cheese onto each of the crostini. Top each one with an arugula leaf and one tablespoon of the squash bruschetta. Drizzle with balsamic glaze.
Transfer to a large serving platter and enjoy! Leftover bruschetta can be stored in an airtight container in the refrigerator for up to 3 days.