Using an electric pressure cooker, press Sauté and adjust it to high heat. Once the pot is hot, add oil. Brown the chicken skin side down for about 3 minutes. Turn over and brown the other side, about 3 minutes. Remove to a plate and set aside. Discard the marinade.
Add onion and sauté until translucent, about 2 minutes. Add garlic and cook until fragrant, about 1 minute.
Add carrots and potatoes and cook for 2 minutes. Stir in cumin and turmeric and cook for another 1-2 minutes.
Pour in chicken broth, scraping the brown bits to deglaze, scraping up the brown bits from the bottom of the pot as you go. Add coconut milk, chicken and any drippings.
Close and lock the lid, making sure the steam knob is on Sealing/Locked. Pressure cook on high for 8 minutes.
Once the cooking is done, quick release the pressure.
Press Sauté to simmer the sauce. In a small bowl, dissolve 1 tablespoon cornstarch in 1 tablespoon water and stir the slurry into the sauce. Heat through until sauce thickens. Season with salt to taste.