Place removable pan inside programmable pressure cooker. Using sauté function, cook bacon, uncovered, until crisp. Use slotted spoon to remove bacon from pan.
Drain bacon on paper towels. Leave 1 tablespoon drippings in pan; discard remaining. Add chicken to bacon drippings in pan in two batches.
Using sauté function, stir-fry chicken 2-3 minutes, or until cooked through. Use slotted spoon to remove chicken from pan. Repeat until all chicken is cooked. Press cancel.
Stir pasta, broth, garlic, Italian seasoning and pepper into drippings in pan. Secure lid and set pressure release to sealing function. Select high-pressure setting and cook 5 minutes. Press cancel. Allow pressure to release naturally for 5 minutes. Move pressure release to venting function to release any remaining steam.
Remove lid. Stir cream into pasta mixture. Using sauté function, cook and stir, uncovered, until boiling. Boil, uncovered, about 4 minutes, or until sauce generously coats pasta, stirring frequently. Press cancel. Stir in chicken and Parmesan cheese.
Place spinach and bacon in large bowl. Pour pasta mixture over top. Toss until combined. Ladle into serving bowls. Top each serving with tomatoes.