Heat The Oil In A Large Skillet Over Medium-High Heat. Cook And Stir The Bell Pepper And Onion In The Oil Until Slightly Tender, 5 To 7 Minutes. Remove Pepper And Onion From The Skillet And Set Aside. Add The Chicken To The Skillet; Season With Jerk Seasoning; Cook And Stir Chicken Until No Longer Pink Inside. Pour The Plum Sauce In With The Chicken; Add The Bell Peppers And Onions; Toss To Combine. Cook Until The Peppers And Onions Are Heated Completely, 3 To 5 Minutes. Sprinkle With Soy Sauce And Chopped Peanuts To Serve.