Begin by making slits in the chicken breasts. Massage the spices listed in Marinade 1.
Blend the yogurt, ginger, garlic, and other spices listed in Marinade 2.
Add the yogurt blend to the chicken breasts and massage the chicken well. Cover and refrigerate overnight for best results. If you're short on time, marinate the chicken for at least 4 hours.
The next day - prepare the tandoori spice mix. Using a coffee grinder, add all the spices listed under Tandoori Spice Mix and blend. Chop the onions and bell peppers.
In an Instant Pot, hit SAUTE mode. Once hot, add oil followed by a black cardamom. Cook for 20 seconds or so. Add the onions and cook for 5 mins.
Then add the red and green bell peppers. Season with salt and cook for another 5 minutes.
Now add the prepared Tandoori Spice Mix along with 2 tbsp of water. The water prevents the spices from burning. Stir. Hit CANCEL on the Instant Pot.
Cut the chicken breasts into halves, add them over the onion and pepper saute.
Cover the Instant Pot. Set the Pressure Release Valve to "Sealing". Hit HIGH PRESSUR10 minutes. And then 20 minutes natural release.
Make sure the steam is released from the Instant Pot before opening it. This is what you'll have once the chicken is cooked.
Using 2 forks, shred the chicken.
Add the chicken back in the Instant Pot.
Season with Indian red chili powder, dry fenugreek leaves (kasoori methi), and chat masala. Stir.
Yogurt Sauce
Add all the ingredients for the sauce in a small food processor. Blend and this is what you should have. You can add a little water to thin it out, however I didn't.
Assemble Tacos
Take a gluten-free corn tortilla (or whatever you like), top with shredded purple/green cabbage, add shredded chicken, and finish it off with yogurt sauce. Enjoy!