"What is Crushed Chilli? Crushed chilli (also called simply red pepper flakes or crushed red pepper) are dried and crushed, fully ripened (ie.red) chili peppers.

Which chili peppers, you ask? Usually it's a combination of different types, including jalapeño, Fresno and cayenne.

Often you'll even find bell peppers in the mix! Because all the heat-containing seeds and ribs of the peppers are left in, crushed red pepper flakes are quite spicy and provide a great way to add heat to a dish."