Spray 6-quart Instant Pot™ insert with cooking spray. Select SAUTE; adjust to normal. Add oil to insert. Add beef in 2 batches; cook 2 to 4 minutes on first side until browned. Turn, and cook 2 to 4 minutes longer on second side or until browned; transfer to medium bowl. Add onions, mushrooms and bacon to insert; cook 4 to 5 minutes, stirring occasionally, until onions start to soften. Bacon may not be fully cooked. Select CANCEL.