To a pressure cooker add chicken, vegetables, seasonings, 2 tbsp tomato paste and diced tomatoes. Cook on poultry option or on high pressure for 15 minutes. Allow to naturally release 10 minutes. Remove chicken and shred. Return to the pot.
Steam cauliflower per package instructions. Add to a small blender. To the blender add 1.5 tbsp tomato paste, 1 tsp dried basil, 2 wedges of spreadable cheese and 1/4 of liquid from the cooked chicken.
Add the blended tomato mixture to the pot. Serve with grated parmesan cheese.