Preheat oven to 350*
In a large bowl stir together:
6 cups rolled oats (not instant or quick-cooking)
1 cup bran (I use bran cereal)
2 cups total of nuts and/or seeds - walnuts, pecans, almonds, cashews, peanuts, sunflower seeds, sesame seeds,etc. (you get the idea)
1 cup dried coconut (optional)
1 cup honey or pure maple syrup, more or less to taste
1/4 tsp salt
1 teaspoon cinnamon
1/2 teaspoon vanilla extract
Mix well, then pour onto 10x15" sheet pan sprayed with cooking spray. Spread out evenly. Bake for 30-35 minutes, stirring once or twice. Remove from oven when browned, being careful not to let it burn.
Cool, then stir in 1 cup total of any mix-ins you would like: raisins, banana chips, dried cranberries, chocolate chips, M&M's, peanut butter chips, etc.
Put in sealed container and store in refrigerator.