Shahi Mutter Paneer //Cottage Cheese and Peas in a Creamy gravy

1 big onion
2 big tomatoes
1 green chilli
1-5 garlic pods
1/2 inch ginger
1 teaspoon of water melon seeds
5-6 cashew nuts
2 teaspoon curd
11/2 teaspoon oil
1/2 teaspoon cumin seeds/jeera
1 cup mutter / peas
150 gms paneer/cottage cheese
1/2 teaspoon turmeric powder
1 teaspoon coriander powder
1/2 teaspoon chilli powder
salt to taste
coriander leaves
1/2 teaspoon garam masala powder (optional)