Pre-heat oven to 250 degrees.
In a large bowl, mix oats, almonds, cashews, pecans, sunflower seed kernels and flax seeds.
In a small bowl, mix brown sugar, honey, coconut oil and vanilla.
Add brown sugar mixture to oats and nuts. Toss to coat.
Spread mixture out onto 2 parchment lined baking sheets.
Bake for about and 1 hour and 15 minutes, stirring several times as it bakes.
Remove from oven and let it cool.
Once cooled, store in an air-tight container.