Spray Instant Pot™ insert with cooking spray. Select SAUTE; adjust to normal. Add bacon to insert; cook 7 to 9 minutes, stirring occasionally, until crisp. Select CANCEL. Using slotted spoon, transfer bacon to paper towel-lined plate.
Stir potatoes, green onion whites and salt into bacon drippings in insert. Stir in broth. Secure lid; set pressure valve to SEALING. Select MANUAL; cook on high pressure 6 minutes. Select CANCEL. Set pressure valve to VENTING to quick-release pressure.
Mash potatoes in pot; stir in cream cheese until combined.
Spoon into bowls. Top with Cheddar cheese, bacon and green onion greens.