Set the Instant Pot to Saute mode. Melt the butter, then saute the onion until translucent.
Add the garlic and bell pepper, and cook for about 2 minutes.
Turn the Instant Pot off, and stir in the spices. Add the rice, and stir to combine.
Pour in the chicken broth, and then add the frozen shrimp on top.
Once the pressure is released, open the Instant Pot. Add the juice and zest from half a lime. Stir. Portion and serve, garnishing with the green onions.