Preheat oven to 325 degrees F. In a small saucepan combine applesauce, brown sugar, butter, honey, vanilla, and salt. Cook and stir over low heat until butter is melted and brown sugar is dissolved.
In an extra-large bowl combine oats, pistachio nuts, almonds, pumpkin seeds, sunflower kernels, and cinnamon. Drizzle applesauce mixture over oats mixture; stir to coat. Transfer to a 15x10x1-inch baking pan or a shallow roasting pan.
Bake for 45 minutes, stirring twice. Stir in raisins. Transfer to an extra-large bowl; cool. Stir in chocolate pieces. Store in an airtight container.