Place rice and oil in a bowl. Using your fingers, break apart rice and coat with oil. Carefully remove pan from oven; spread rice mixture in an even layer in center of pan. Bake in preheated oven for 5 minutes; stir. Top rice with pineapple and bell pepper; bake at 450°F for 5 minutes. Arrange shrimp over rice mixture; bake at 450°F until shrimp are done, about 6 minutes.