In a small mixing bowl, combine all the ingredients: brown sugar, smoked paprika, garlic powder, onion powder, black pepper, salt, cayenne pepper, ground cumin, and dried oregano.
Use a whisk or spoon to mix thoroughly until all ingredients are evenly blended, forming a uniform rub.
Taste the rub and adjust seasoning if necessary, adding more cayenne for heat or sugar for sweetness based on your preference.
Transfer the rib rub into an airtight container or jar for storage. The rub can be stored for up to 6 months in a cool, dry place.
When ready to use, generously coat your ribs with the rub, ensuring an even coverage. Let the ribs sit for at least 30 minutes before grilling or smoking for the best flavor.