Adjust the oven rack to the middle position and pre-heat to 325 F. Line a half sheet pan with parchment paper and set aside.
In a large mixing bowl, whisk together olive oil, honey, vanilla extract, cinnamon, and salt until smooth and combined.
Add oats, nuts, and seeds. Stir until oats are evenly coated.
Transfer the mixture to the lined sheet pan. Using a spatula, gently press the oat mixture into a thin and even layer across the pan. Top with a generous sprinkle of flakey sea salt.
Transfer to the oven and bake for about 25-30 minutes, flipping halfway. After you flip, use a spatula to press the granola back down into a thin and even layer. *Bake until the granola is a medium golden brown color, adding more time as needed. This is important for making it crispy!
Remove from oven and let your granola cool in the pan for at least an hour, undisturbed. Then, break it up with your hands until your granola has reached your desired consistency.
Serving size is about 1/3 cup.
Calories: 153kcal, Carbohydrates: 18g, Protein: 3g, Fat: 8g, Saturated Fat: 1g, Polyunsaturated Fat: 2g, Monounsaturated Fat: 5g, Trans Fat: 0.002g, Sodium: 66mg, Potassium: 103mg, Fiber: 2g, Sugar: 8g, Vitamin A: 0.4IU, Vitamin C: 0.1mg, Calcium: 23mg, Iron: 1mg