Boil spinach leaves in water for 2-3 mins. Remove them from hot water and immediately add them to cold water. This is called blanching.
In a blender jar, add blanched spinach along with blanched green peas and coriander leaves. Blend into a coarse paste and set aside.
In a pan, heat oil. Add cumin seeds and as they splutter, add finely chopped onions and fry until translucent. Next, add ginger garlic paste and fry until the raw smell is gone.
Add boiled potatoes and mash them in well. Next add the prepared spinach green peas paste.
Mix everything together and add red chilli powder, garam masala powder, coriander powder, cumin powder, dry mango powder and turmeric powder along with salt.
In another pan, dry roast gram flour/besan until nutty aroma comes up.Add it to the potato, spinach and green peas mas, mix well.
Prepare Kababs of desired size and shape, set aside.
Heat a flat pan and drizzle few drops of oil. Place the prepared Kababs on the hot pan and cook on low flame until the bottom is golden brown. Gently flip onto other side and drizzle some oil around the Kababs, cook until golden brown.