Take a frying pan or wok and heat it on a low flame on your gas stove.
When it is quite hot, put 8 pieces of dry red chilies, 8 pods of green cardamom, 2 tsp of coriander seeds, 1 tsp of black pepper, 1 tsp cumin seeds, ½ tsp of fennel seeds, and ½ tsp of fenugreek seeds in the wok.
Stir the spices continuously for about 2 to 3 minutes to roast them nicely on a low flame.
When you smell the aroma of the roasted spices, turn off the gas stove. Transfer the spices to a plate. Let it sit for some time so that the spices cool off completely.
Now, take a dry and clean grinder.
Transfer the roasted spices to the grinder.
Grind them into a powder. Never mind if it is coarse.
Check the powder. If you want the texture to be a bit finer, grind it again.
Now, pour out the powder from the grinder to a plate and your kadai masala powder is ready for use.