1-First Step: Mise en Place Measure all ingredients accurately using a kitchen scale for flour and sugar. Soften butter at room temperature until pliable but cool. Prepare your workspace with parchment paper and a rolling pin dusted lightly with flour. Print high-resolution photos (300 DPI) on edible wafer paper using food-safe ink. Cut images to fit cookie shapes, arranging 4-12 per sheet in collage style for variety.

2-Second Step: Cream Butter and Sugar In a large bowl, beat softened butter and granulated sugar with an electric mixer on medium speed for 3 minutes until light and fluffy. Scrape sides often. This step incorporates air for tender cookies. Avoid overbeating to prevent greasy dough.

3-Third Step: Add Wet Ingredients Beat in the egg and vanilla extract until fully combined, about 1 minute. Mix in milk gradually. The dough should look smooth and glossy. If too wet, chill briefly before proceeding.

4-Fourth Step: Incorporate Dry Ingredients Whisk flour, baking powder, and salt in a separate bowl. Gradually add to wet mixture on low speed, mixing just until a dough forms. Do not overmix to keep cookies soft. Form into two disks, wrap in plastic, and chill for 1 hour.

5-Fifth Step: Roll and Cut Dough Preheat oven to 350°F (175°C). Roll chilled dough to 1/4-inch thickness on floured surface. Use 2-4 inch cutters for rounds or rectangles. Place on parchment-lined baking sheets, 2 inches apart. Re-chill cutouts 10 minutes to hold shape.

6-Sixth Step: Prepare Royal Icing Whisk meringue powder into water, then beat in powdered sugar gradually until stiff peaks form, 5-7 minutes. Divide into bowls: thin one batch with water for flooding (outline consistency drops off spoon in 10 seconds). Color others for details. Cover with damp towel to prevent drying.

7-Seventh Step: Ice the Cookies Once cookies cool completely (1 hour), pipe a dam of thick royal icing around edges. Flood centers with thin icing using a squeeze bottle. Let set 4-6 hours or overnight for smooth base.

8-Eighth Step: Apply Collage Designs Cut printed edible images to fit iced surfaces. Gently press onto set icing, smoothing edges. Pipe thin borders with colored icing for framed look. Arrange multiple images per cookie for collage effect, like family photos or event collages.

9-Final Step: Finishing Touches and Serving Allow designs to dry 24 hours for travel-safe cookies. Serve on platters for parties. Store as detailed below. Pair with milk or tea for complete enjoyment. These simple cookie decorating steps create stunning cookie designs everyone loves.