01 - Whisk together flour, baking powder, and salt in a medium bowl. Set aside for later use.
02 - Beat softened butter and granulated sugar in a large bowl until light and fluffy, approximately 2-3 minutes.
03 - Mix in the egg, vanilla extract, and almond extract until fully incorporated into the butter mixture.
04 - Gradually add the dry ingredients to the wet mixture, mixing just until a dough forms. Avoid overmixing.
05 - Divide dough in half, flatten into discs, wrap in plastic wrap, and refrigerate for at least 1 hour.
06 - Preheat oven to 350°F. Line baking sheets with parchment paper and set aside.
07 - On a lightly floured surface, roll one dough disc to 1/4-inch thickness. Cut out bunny shapes with cookie cutter and place 2 inches apart on prepared baking sheets.
08 - Bake for 9-11 minutes until edges are just lightly golden. Let cool on baking sheets for 5 minutes, then transfer to wire rack to cool completely.
09 - Beat powdered sugar and egg whites on low speed until combined, then increase to high speed and beat until stiff peaks form, about 5 minutes. Add additional water if needed for flooding consistency.
10 - Divide icing into separate bowls and tint each with gel food coloring to achieve desired pastel shades.
11 - Fill piping bags or squeeze bottles with colored icing. Decorate cooled cookies and add sprinkles or pearls before icing sets.
12 - Allow decorated cookies to dry completely for 2-4 hours before storing or serving.