Preheat oven to 375 degrees. In a 2-quart or larger baking dish, add rice, butter, and salt. Stir in boiling water until butter is melted.
Cover and bake until rice the water is absorbed and the rice is tender, about 30 to 35 minutes. Fluff rice with a fork.
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Notes
Long-grain rice: Any rice works such as long-grain American, basmati, or jasmine. Brown rice takes longer to cook, so plan on at least an hour in the oven.
Butter: It's okay to reduce the butter to 2 tablespoons. Or, substitute 2 tablespoons olive oil.
Yield: This recipe makes about 6 cups cooked rice (1 cup uncooked rice yields about 3 cups cooked).
Storage: Store leftovers covered in the refrigerator for up to 4 days.