I like to mix my blackening seasoning rub in a small bowl or a mortar. Most spices are already pre-ground, so there's no need to use the pestle to crush the spices. Just stir them together in the bowl, so they blend well. I use a teaspoon of paprika and cumin, the two flavors I like to highlight. Next, I use a ½ teaspoon of garlic powder, onion powder, and salt. Then I go a little lighter on the heat with a ¼ teaspoon of chili powder and black pepper. I also use a teaspoon of brown sugar and blend it together as my rub. You can adjust amounts to suit your taste.