Heat oil in a pan on a medium low. Once it's hot add cumin seeds, and then add ginger, garlic, green chilies, and chopped onions. Saute everything for about 4 to 5 minutes.
Now add Chicken and mix well. Let Chicken cook on a medium to high heat uncovered. Now add shan chicken biryani masala, turmeric, red chili powder, and salt to taste. Keep cooking until chicken is tender. Make sure there is no liquid, and your chicken is dry and oil starts to separate.
Now at this point add chopped tomatoes, green peas, mint, and cilantro. mix it well and cook everything for about 2 minutes.
Add your cooked rice along with cashews in the chicken. Once everything is mixed well then trun off the stove. Serve this delicious rice with your favorite raita( yogurt), sliced cucumbers, and onions.