"Seasoned flour" refers to flour that has been mixed with various spices and seasonings to enhance the flavor of food when it is coated or cooked with it. Full definition
Fold tortilla, dip in buttermilk, dip in seasoned flour and repeat. (the-chew-recipes.com)
In a shallow dish, season the flour with salt and pepper. (ahintofhoney.com)
Use your hands to transfer the chicken from the marinade to the bag of seasoned flour, letting any excess marinade stay behind in the bowl. (cookingchanneltv.com)