Toast the nuts on a foil lined sheet for 3 to 4 minutes, then remove them from the oven and let them cool while you make the sauce.
3 cups mixed nuts
Add butter, brown sugar, maple syrup, cayenne, cinnamon, and salt to a small pot and cook until fully melted and emulsified, about 3 minutes.
2 tbsp butter, 5 tbsp brown sugar, 2 ½ tbsp maple syrup, 1 to 1 ¼ tsp cayenne, 1 tsp cinnamon, 1 ½ tsp salt
Add the toasted nuts and pretzels to a bowl and toss with the sauce until everything is coated, careful not to break the pretzels. You can also toss everything with the sauce on the sheet tray but it will be more challenging (in our experience).
3 cups pretzel twists
Bake the nuts and pretzels at 350°F on the same foil lined sheet for 7 minutes. Remove from the oven and use a spatula to toss the nuts, then place them back in the oven and bake for another 7 minutes.
Toss the nuts again, then let them cool completely before eating.