Homemade Fajita Seasoning. Ingredients 1 Tbsp chili powder 1 1/2 tsp cumin 1 tsp black pepper 1 tsp salt 1/2 tsp paprika 1/2 tsp dried oregano 1/4 tsp garlic powder 1/4 tsp onion powder ¼ tsp crushed red pepper (optional). Whisk together all of the spices and store in an airtight container.