PLACE ALL INGREDIENTS UP TO CHICKEN IN INSTA POT AND MIX WELL. PUSH CHICKEN INTO SAUCE. CLOSE POT AND COOK FOR 10 MINUTES OH HIGH. RELEASE PRESSURE NATURALLY FOR 10 MINUTES THEN RELEASE MANUALLY. REMOVE CHICKEN. BLEND SAUCE INGREDIENTS WITH IMMERSION BLENDER. LET COOL SLIGHTLY. ADD THE BUTTER, MILK, GARAM MASALA AND STIR WELL. ADD THE CHICKEN BACK IN. SERVE OVER RICE OR NOODLES. SPRINKLE WITH CILANTRO.