Whisk together the paprika, salt, pepper, sugar, garlic powder, onion powder, cayenne pepper and mushroom powder (if using) until combined.
Store in an airtight container at room temperature for up to 3 months.
To use, sprinkle on hamburger patties before cooking.
Ground mushroom powder adds an extra umami richness that makes your burgers taste extra meaty. It’s completely optional. You can find it in most grocery stores or you can make your own by grinding dried porcini mushrooms into a fine powder using a food processor or food mill