Take 1 kg of chicken, preferably from the thigh area, and cut into small boneless pieces.
Chop 4 pieces of medium-sized onions (roughly diced) in a chopper. Remove them in a bowl, squeeze out the juice and keep aside.
Now, put 15 cloves of garlic (peeled, whole), 8 pieces green chilies, and 1 piece ginger (2-inch size, roughly sliced) in the same chopper and chop them.
Now, add half of the boneless chicken pieces to it and blend nicely with the ginger, garlic and chilies. Remove it on a plate. Then, blend the remaining chicken pieces and put it on the same plate.
Add the chopped onions to it along with 1.5 tsp of crushed coriander seeds, 1.5 tsp of roasted and crushed cumin seeds, ½ tsp of turmeric powder, ½ tsp of Kashmiri red chili powder, 1 tsp of chili flakes, 1 tsp of garam masala powder, ¼ tsp of nutmeg and mace powder, 2 tbsp of butter after melting, salt to taste, and a handful of finely chopped coriander leaves.
Mix everything nicely. Spread it evenly on the plate and leave it aside for about 10 to 15 minutes to set properly.
Put the keema paste on skewers and press them in the middle to divide them into two parts as shown.
Put them on a charcoal grill. Turn them in between. Remove them on a plate when done. Put some molten butter on them to enhance the taste.
Your tasty and spicy chicken seekh kabab is ready to enjoy. Sprinkle a bit of chaat masala powder on them and serve hot with green chutney and cucumber-pudina-onion salad and lemon wedges.