Preheat the oven to 350°F and coat a large sheet pan (18x13 inches) with cooking spray or parchment paper.
Put the rolled oats, walnuts, almonds, and cashews in a large bowl. Stir together gently.
Mix together the honey, salted butter, and cinnamon in a small bowl until completely combined.
Pour the honey mixture over the rolled oat mixture and stir until everything is well-coated.
Spread out evenly onto the prepared sheet pan.
Bake in the oven for 6 minutes, and then stir the granola.
Return the pan to the oven for another 6 to 12 minutes or until the oats are a nice golden brown color.
Once the granola is cooked, let it cool on the sheet pan until it has completely cooled to room temperature. Do not stir until it is completely cooled.
Mix in the dried cranberries and white chocolate chips with the cooled granola.
Serve or store in a container until ready to serve.