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How to Make Flooded Icing Cookies

Flooded icing cookies are made by outlining baked sugar cookies with thick royal icing, then flooding the center with thinned icing that flows to create a smooth, glossy surface. The key is getting your icing consistency right — thick enough to hold a line, thin enough to self-level when flooded.

Total time: 6 hr 20 min
Hands-on: 20 min
Difficulty: Medium

Ingredients

3 cups powdered sugar
2 egg whites
3 tablespoons meringue powder
1/4 cup water
gel food coloring

Step by step

Make royal icing base. Beat 3 cups powdered sugar with 2 egg whites or 3 tablespoons meringue powder plus 1/4 cup water until thick peaks form. This is your outline consistency — it should hold its shape when piped.
Divide and thin the icing. Reserve half the thick icing for outlining. Thin the remaining half with water, one teaspoon at a time, until it flows like honey. Test by lifting your spoon — the ribbon should disappear into the surface within 10 seconds.
Color your icing. Add gel food coloring to both consistencies. Keep outline icing slightly darker than flood icing since wet icing dries lighter. Mix thoroughly to avoid streaking.
Outline the cookies. Fill a piping bag with thick icing and cut a small tip. Pipe a border around each cookie edge, staying about 1/8 inch from the outer edge. Let dry for 10 minutes until the outline feels set.
Flood the centers. Fill squeeze bottles or piping bags with thin icing. Flood inside the outline, working quickly. The icing should flow to meet the borders. Use a toothpick to guide icing into corners and pop any air bubbles.
Let dry completely. Leave cookies undisturbed for 6-8 hours until the icing is completely hard and no longer tacky to touch. Properly dried icing will have a smooth, matte finish.

Tips & troubleshooting

Cover both icing consistencies with damp towels between uses to prevent crusting
Work with one color at a time and flood all cookies of that color before moving to the next
Tap cookie sheets gently on the counter after flooding to help icing settle and eliminate bubbles
Use a scribe tool or toothpick to guide icing into sharp corners and detailed areas

Variations

Wet-on-wet designs. Drop contrasting colors into wet flood icing and drag with a toothpick to create hearts, swirls, or feathered patterns
Multiple flood sections. Create different colored sections by piping dividing lines within your outline, then flooding each section with different colors
Textured flooding. Add sanding sugar or sprinkles to wet flood icing for sparkle and texture

Questions

Why is my flood icing too thick?: Add water one quarter teaspoon at a time. The icing should flow smoothly but not be so thin that it runs off the cookie or breaks through the outline.
How do I fix lumpy royal icing?: Strain the icing through a fine-mesh sieve to remove lumps, or mix longer on low speed. Sifting powdered sugar before mixing prevents most lumps.
Can I speed up the drying process?: Place cookies in front of a fan or in a warm, dry room. Avoid ovens or direct heat which can cause cracking. Patience gives the best results.
Why did my icing crack while drying?: The icing was likely too thick, dried too quickly, or the cookies were still warm when decorated. Let cookies cool completely before icing.