Set cooker to saute-high. Place the sliced bacon in the cooker. Cook for 10 minutes or until crisp. Transfer the bacon to a plate with paper towel (drain grease). Once cool to the touch, chop them into bit size and set aside for later. Remove bacon grease from the cooker (save or discard).
Place the ground chuck/beef in the cooker. Cook for 5-7 minutes or until no longer pink. Add onion and cook for 1-2 minutes or until the onions becomes translucent. Optional: Drain the beef grease.
Add salt, black pepper, garlic powder, mustard, ketchup, beef broth and mix. Add pasta sea shells and mix.
Place the lid on. Set to pressure cook on high for 5 minutes. Then quick release (be careful when releasing the pressure from the cooker). Follow the manufacture instructions for quick release. Remove lid.
Add shredded cheese on top of the pasta, do not stir. Place the lid back on for 3 minutes. Remove the lid and mix everything evenly. Add diced pickles (optional), bacon bits and mix. Season with salt to taste.