Preheat the oven to 350 degrees.
Grease a sheet pan generously with vegetable oil.
Combine the cashews, walnuts, pecans, almonds, 2 tablespoons of vegetable oil, maple syrup, brown sugar, orange juice, and chipotle powder on the sheet pan.
Toss with your hands to coat the nuts evenly.
Add 2 tablespoons of the rosemary and 2 teaspoons of salt and toss again.
Spread the nuts in one layer.
Roast the nuts for 25 minutes.
Stir with a large metal spatula twcie until nuts are glazed and golden brown.
Remove from the oven and sprinkle with 2 more teaspoons of salt and the remaining 2 tablespoons of rosemary.
Toss well and set aside at room temperature.
Stir a few times to avoid sticking.
Serve warm or cool completely.
Makes a LOT!