In a bowl, whisk together the white pepper, ground black pepper, dried parsley, brown sugar, garlic powder, salt, accent seasoning, smoked paprika, cayenne pepper and onion powder.
Transfer to a mason jar and store in a cool, dry place for up to 6 months.
Notes
Make sure to store in an air tight container to preserve the freshness of your whataburger seasoning. Mason jars work really well.