01 - Preheat oven to 350°F. Line two baking sheets with parchment paper and set aside.
02 - In a medium bowl, whisk together flour, baking powder, and salt until evenly blended.
03 - In a large bowl, beat softened butter and granulated sugar using an electric mixer until light and fluffy, approximately 3 minutes.
04 - Add egg and vanilla extract to the butter mixture. Beat until fully combined and smooth.
05 - Gradually add dry ingredients to the wet mixture, mixing on low speed just until dough forms. Avoid overmixing.
06 - Divide dough into two equal discs. Wrap tightly in plastic wrap and refrigerate for at least 30 minutes.
07 - On a lightly floured surface, roll dough to 1/4-inch thickness. Use bunny-shaped cutter to cut cookies. Place 2 inches apart on prepared baking sheets.
08 - Bake for 8 to 10 minutes until edges are barely golden. Cool completely on wire racks before frosting.
09 - Beat softened butter until creamy. Gradually incorporate powdered sugar, milk, and vanilla extract. Continue beating until smooth and spreadable. Tint portions with food coloring if desired.
10 - Frost cooled cookies using piping bags or spatulas. Add candy eyes or sprinkles to create bunny faces. Allow frosting to set completely before serving.