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 well blended.
03 - In a large bowl, beat softened butter and granulated sugar with an electric mixer until light and fluffy, approximately 2-3 minutes.
04 - Beat in the egg and vanilla extract until fully incorporated into the mixture.
05 - Gradually add the dry ingredients to the wet mixture, mixing just until a cohesive dough forms.
06 - Divide dough in half, shape into flat disks, wrap tightly in plastic wrap, and refrigerate for 30 minutes.
07 - On a lightly floured surface, roll dough to 1/4-inch thickness. Cut with round or flower-shaped cookie cutters.
08 - Arrange cookies 2 inches apart on prepared baking sheets. Bake for 10-12 minutes until edges are lightly golden.
09 - Let cookies rest on baking sheets for 5 minutes, then transfer to a wire rack to cool completely before decorating.
10 - Beat softened butter until smooth and creamy. Gradually incorporate sifted confectioners sugar, mixing thoroughly after each addition.
11 - Mix in milk, vanilla extract, and salt. Beat for 2-3 minutes until fluffy. Add additional milk 1 teaspoon at a time if needed for piping consistency.
12 - Divide buttercream among separate bowls and tint each portion with gel food coloring to achieve desired shades.
13 - Fit piping bags with small star, petal, and leaf tips. Fill each bag with a different colored buttercream, removing air pockets.
14 - Pipe flowers and decorative leaves onto the completely cooled cookies using steady, even pressure for consistent shapes.
15 - Allow decorated cookies to rest at room temperature until the buttercream firms slightly and holds its shape, about 30 minutes.