Whisk all ingredients together and keep in an airtight container.
½ cup brown sugar, 2 tbsp chili powder, 2 tbsp smoked paprika, 2 tsp cumin, 1 tsp garlic powder, 1 tsp onion powder, 2 tsp dried thyme, 1 tsp dried oregano, 2 tsp ground mustard, 2 tsp kosher salt, 1 tsp black pepper