In Ninja, there are two ways to single serve: using the Single Serve button or by adding a recipe. To use the Single Serve button, first locate it on the main screen. Then, add the ingredients you want to use and press the button. Ninja will automatically create a single-serve recipe for you based on the ingredients you added. If you want to create a custom single-serve recipe, you can do so by adding recipes to the "Favorites" section of your Ninja. First, add the ingredients you want to use to your shopping list. Then, locate the "Favorites" section of your Ninja and add the recipe. When you're ready to cook, just select the recipe and press the "Single Serve" button. Ninja will automatically adjust the recipe based on the number of servings you have selected.