Position rack in middle of oven and preheat oven to 375 degree. Mist a large rimmed baking sheet with cooking spray. Mix oats, nuts, sunflower seeds, cinnamon and salt in a large bowl. In a saucepan, combine brown sugar, honey and oil and bring to a simmer over medium heat.
Remove from heat and carefully stir in vanilla. Pour hot liquid over oat mixture, stir and toss until thoroughly mixed.
Spread granola on baking sheet and bake until golden brown, 20-25 minutes, stirring occasionally to ensure even baking. Transfer granola to a large bowl and let ool, stirring occasionally.
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