Cayenne pepper is a well-known way to add moderate heat to dishes and is widely available in powdered form. If your dish calls for cayenne powder and you are out, you have many easy-to-find options that can bring the heat to your dish, but note – many do so with extra flavor notes that can change the profile of your meal.
Best Cayenne Pepper Substitutes:
Crushed red pepper
Crushed red pepper often uses cayenne pepper as a base (along with a few other chilies), so you can ground the red pepper flakes down into a powder for a decent cayenne pepper substitute – though it will never be as hot. Gochugaru is ground Korean red pepper consisting of red chilies that have been dried in the sun. While not as hot as cayenne peppers (10,000 Scoville heat units compared to 30,000 – 50,000 for cayenne powder), these chilies still pack plenty of heat. They also have a delightful red color that should stand out in your dish.
Hot Spanish paprika is not quite as hot as cayenne powder, but you can compensate for that by adding more of it. Its appearance is very similar to that of cayenne powder, allowing it to imbue dishes with a similar red hue. If the reason that you need a substitute is that cayenne pepper is too hot, pimenton is ideal since you have options that range from mild to hot. Note that pimenton is smoked, so you will have to account for that when deciding whether to use it in a dish. On the bright side, the smokiness should complement the other flavors in a recipe that calls for cayenne.
Both of these chilies work, but they have distinct flavor profiles compared to the more neutral flavor of cayenne pepper powder. Consider their use accordingly.
The jalapeño is arguably the best-known chili pepper in the United States due to its relatively low heat level and high level of flavor. Jalapeño powder make an excellent low-heat substitute for fresh cayenne peppers and should work well in most of the dishes that call for fresh cayennes, though there is a brightness to the flavor which is quite different than cayenne.