For a richer flavor, use brown butter in the masa. Simply melt the butter in a saucepan over medium heat and cook until it turns golden brown and has a nutty aroma. Let it cool slightly before using. If you don't have rice flour, you can substitute it with more masa harina. The tamales can be made ahead of time and stored in the refrigerator for up to 3 days. Reheat them in the steamer before serving. Serve warm with a dusting of powdered sugar and a sprinkle of cinnamon for an extra touch of sweetness.