Preheat oven to 325 degrees F (165 degrees C). Line 2 rimmed baking sheets with parchment paper.

Spread sunflower seeds on 1 baking sheet. Spread hazelnuts on the another baking sheet.

Toast sunflower seeds and hazelnuts in the preheated oven until they start to turn golden brown and become fragrant, 10 to 15 minutes. Chop hazelnuts into smaller pieces.

Combine sunflower seeds, hazelnuts, oats, flour, cinnamon, and salt in a large bowl.

Stir honey, butter, sorghum syrup, and vanilla extract together in a saucepan. Cook over medium heat until butter is melted and mixture is bubbling, 3 to 5 minutes. Pour over oat mixture and mix well to combine. Spread granola evenly on the baking sheets.

Bake 1 baking sheet at a time in the preheated oven until granola is golden, about 9 minutes. Remove from oven, stir, and continue baking, about 9 minutes more. Repeat with second baking sheet.