Line one large baking sheet with aluminum foil or parchment paper.
Combine the oats, oat bran & pecans in a large bowl.
Melt the butter in a medium saucepan. Add the maple syrup, brown sugar, honey and vanilla extract. Bring to a simmer over medium heat, then pour over the dry ingredients, & stir to coat.
Spread the mixture out evenly on the baking sheets. Press into baking sheet. Drizzle with extra honey if desired. Bake in the preheated oven until crispy & toasted, about 30-45 minutes. Do not stir. Remove from oven and allow to cool completely before transferring to a different container.