Cut chicken breast with bone into 1 cm thick rings. Rub oil, coriander powder, red chilly powder, salt and turmeric. Place them in a really hot thick pan and about 2 mins later add some ghee on them. Cover and cook for 5 mins on low heat. Open and flip them over. The chicken is ready in another 3-4 mins. Total time taken for all of this is less than 20 mins. Remove the chicken.
Without wasting any time add some garlic and spinach. Cover the pan, switch off the stove and let them sit in it for a minute or two. The residual heat cooks the spinach.
While the the chicken was cooking dry roast some walnuts, pepper and cumin. Run them thru a blender. Add the cooked spinach with garlic and make a rough puree out of it.
Make your Keto Sandwich with some onion and tomatoes between the chicken and the Walnut-Spinach pesto.
Total time is less than 30 minutes starting from scratch.