Instructions

1. Preheat oven: Preheat to 350°F (175°C). Line baking sheets with parchment paper.
2. Cream butter & sugar: Beat butter and sugar until light and fluffy. Add egg and vanilla and mix until combined.
3. Combine dry ingredients: In a separate bowl, whisk flour, baking powder, and salt.
4. Form dough: Gradually add dry ingredients to wet mixture until a soft dough forms.
5. Roll & cut: Roll dough to 1/4-inch thickness on a lightly floured surface. Cut into shamrock or festive shapes.
6. Bake: Bake for 8–10 minutes, until edges are lightly golden. Cool completely on a wire rack.
7. Make buttercream: Beat butter until creamy. Gradually add powdered sugar, milk, and vanilla. Mix until smooth and fluffy. Add green food coloring.
8. Decorate: Frost cooled cookies and top with sprinkles if desired. Let frosting set before serving.