Add the smoked paprika, garlic powder, onion powder, dried oregano, dried thyme, black pepper, cayenne pepper, white pepper, dried basil, and salt to a small bowl.
Mix very well until the spices are evenly blended and there are no clumps of paprika, garlic powder, or onion powder.
Taste and adjust if needed. Add a little more cayenne for extra heat, or leave the salt out if you prefer to control the salt in each recipe.
Transfer the Cajun seasoning to a clean, dry spice jar or airtight container.
Store in a cool, dry place away from heat and direct light. Shake the jar before each use.