Preheat your oven to 350°F (175°C). Line a large baking sheet with parchment paper for easy cleanup.
In a large mixing bowl, combine the rolled oats, chopped pecans, and salt. Stir until evenly mixed, ensuring the nuts are well distributed among the oats.
3 cups rolled oats
In a small saucepan over medium heat, warm the maple syrup and vegetable oil until just beginning to simmer and become smooth. Remove from heat and stir in the vanilla extract.
3 cups rolled oats
Pour the warm liquid mixture over the dry ingredients. Use a spatula to stir and coat all the oats and nuts evenly until the mixture appears glossy and well combined.
3 cups rolled oats
Spread the coated mixture evenly on the prepared baking sheet. Bake in the preheated oven for 20-25 minutes, stirring once halfway through, until the granola is golden brown and fragrant.
3 cups rolled oats
Remove the baking sheet from the oven and let the granola cool completely. Once cooled, break into clusters and store in an airtight container for up to two weeks.
3 cups rolled oats