Royal frosting, also known as royal icing, is a smooth, glossy icing that dries to a firm, elegant finish. It’s the go-to choice for decorating sugar cookies, gingerbread houses, and intricate cake designs because it holds its shape beautifully and hardens to a crisp, shiny surface. This recipe yields a versatile, reliable royal frosting that’s easy to color, pipe, and work with, whether you’re a beginner or a seasoned baker.
Ingredients
- 4 cups (480g) powdered sugar, sifted
- 3 tablespoons meringue powder
- 6 tablespoons warm water (plus more as needed)
- 1/2 teaspoon pure vanilla extract (optional, for flavor)
- Gel food coloring (optional)
Instructions
- Prepare your materials: Ensure your mixing bowl and beaters are completely grease-free. Any fat can prevent royal frosting from setting properly.
- Combine dry ingredients: In the bowl of a stand mixer fitted with the paddle attachment, add the sifted powdered sugar and meringue powder.
- Add water and mix: Add 6 tablespoons of warm water to the bowl. Start the mixer on low speed to combine, then increase to medium-high. Beat until the mixture is glossy, thick, and forms stiff peaks, about 5–7 minutes. Scrape down the sides as needed. If using, add vanilla extract in the last minute of mixing.
- Adjust consistency: For piping outlines, the frosting should be thick and hold its shape. For flooding (filling in), add water a few drops at a time until the frosting flows off a spoon in a thick ribbon and disappears back into the bowl within 10 seconds. Divide and thin to desired consistencies as needed.
- Add color (optional): Divide the frosting into bowls and add gel food coloring, a little at a time, mixing well. Gel colors are best because they don’t thin the icing.
- Use or store: Immediately transfer the frosting to piping bags fitted with desired tips. Cover bowls of unused frosting with plastic wrap pressed directly onto the surface to prevent drying out.
Tips
- Substituting egg whites: If you don’t have meringue powder, use 2 large pasteurized egg whites in place of the meringue powder and water. Whip with the powdered sugar until stiff peaks form.
- Preventing clogs: Always sift powdered sugar before mixing, and keep piping tips covered with a damp cloth when not in use to prevent icing from crusting and clogging tips.
- Flavor variations: For a different flavor, swap vanilla extract for almond or lemon extract. Stick to clear extracts to keep the frosting bright white.
- Avoid overmixing: Overbeating can incorporate excess air, leading to bubbles in your decorated cookies. Stop mixing once you reach stiff peaks.
Serving Suggestions
- Decorating cookies: Use royal frosting to outline and flood sugar cookies, gingerbread cookies, or shortbread for a professional bakery finish.
- Gingerbread houses: Its strong hold makes it perfect for assembling and decorating holiday gingerbread houses, as it acts as edible glue.
- Cake accents: Pipe intricate lace, scrollwork, or monograms onto cakes for a classic, elegant look.
- Edible decorations: Pipe small flowers, leaves, or royal icing transfers onto parchment, let them dry, and use them as edible decorations on cakes and cupcakes.
Variations
- Chocolate royal frosting: Add 2 tablespoons of unsweetened cocoa powder to the powdered sugar for a chocolate version. You may need to add a bit more water to reach the right consistency.
- Lemon royal frosting: Replace half the water with fresh lemon juice and use lemon extract for a zesty, bright flavor.
- Vegan royal frosting: Use aquafaba (the liquid from canned chickpeas) instead of meringue powder—3 tablespoons aquafaba per batch. Whip as you would egg whites.
- Colored royal icing: Use gel-based food coloring to tint the icing with vibrant, customizable shades. Avoid liquid colorings, which can thin the frosting too much.
Storage and Reheating
Royal frosting can be stored at room temperature if used within a day, but for longer storage, place it in an airtight container in the refrigerator for up to 1 week. Before storing, press plastic wrap directly onto the surface of the icing to prevent it from crusting. When ready to use, let the icing come to room temperature and stir gently to restore consistency—if needed, add a few drops of water to loosen. For longer storage, royal frosting can be frozen in airtight containers for up to 3 months; thaw overnight in the refrigerator, then bring to room temperature and mix gently before using. Once applied to cookies or decorations, royal frosting will harden in 6–8 hours at room temperature (or overnight for best results). Decorated cookies can be stored in an airtight container at room temperature for up to 2 weeks.
Frequently Asked Questions
- What is the difference between royal frosting and buttercream?
- Royal frosting is made with powdered sugar, meringue powder or egg whites, and water, and it dries to a hard, smooth finish. Buttercream is made with butter (or shortening) and remains soft, creamy, and fluffy, making it ideal for cake covering and softer decorations. Royal icing is best for intricate, crisp designs and decorations that need to hold their shape.
- Can I make royal frosting without meringue powder?
- Yes, you can use pasteurized egg whites as a substitute for meringue powder. Use 2 large egg whites in place of the meringue powder and water. Make sure to use pasteurized eggs for food safety, especially if serving children, elderly, or immunocompromised individuals.
- How do I prevent royal frosting from getting too hard or cracking?
- Royal frosting naturally dries hard, but if it becomes too brittle or cracks, it may be too dry or overmixed. Make sure to add water gradually to reach the right consistency, and avoid overbeating. Humidity can also affect drying—avoid placing decorated cookies near heat sources or in very dry environments, and let them dry at room temperature.
- Why is my royal frosting not hardening?
- If your royal frosting stays soft or sticky, it may be due to too much liquid, high humidity, or the presence of grease in the mixing bowl. Double-check your measurements, ensure your tools are grease-free, and let the icing dry in a cool, dry place. If necessary, add a little more powdered sugar to stiffen the mixture.
- Can I color royal frosting with natural colorings?
- Yes, natural colorings such as beet powder, matcha, turmeric, or freeze-dried fruit powders can be used to tint royal frosting. These may impart subtle flavors and softer hues compared to synthetic gel colors. Be mindful that some natural colorings can thin the icing, so adjust the consistency as needed.
- Is royal frosting safe for people with egg allergies?
- Traditional royal frosting contains meringue powder or egg whites, but you can make a vegan or egg-free version using aquafaba (the liquid from canned chickpeas) as a substitute. This yields similar results in texture and performance, making it suitable for those with egg allergies.