additional ingredients, sauteed if necessary:
Heat oven to 450°. In medium saucepan, heat oil over medium heat. Add shallots, scallions or onions, stirring until translucent, 2 to 3 minutes. Add rice, and stir until grains are shiny and well coated with oil, about 2 minutes more. Add wine (and saffron, if desired). Continue cooking and stirring until liquid is absorbed, 3 to 5 minutes.
Add stock. Cover saucepan; transfer to oven.
Bake for 15-20 minutes. Add cheese and additional ingredients.
Continue baking until all stock is absorbed and rice is tender, about 5-10 more minutes.