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 mixture becomes light and fluffy, approximately 2-3 minutes.
03 - Mix in the egg and vanilla extract until fully incorporated into the butter mixture.
04 - Gradually blend dry ingredients into wet mixture, mixing just until dough comes together. Avoid overmixing to prevent tough cookies.
05 - Divide dough in half, flatten each portion into disks, wrap in plastic wrap, and refrigerate for at least 30 minutes until firm.
06 - Preheat oven to 350°F and line baking sheets with parchment paper.
07 - On a lightly floured surface, roll one dough disk to 1/4-inch thickness.
08 - Cut bunny shapes with cookie cutters and place on prepared baking sheets, spacing 1 inch apart.
09 - Bake for 8-10 minutes until edges are barely golden. Cool on baking sheets for 5 minutes, then transfer to wire racks.
10 - Whisk powdered sugar, milk, and vanilla in a small bowl until smooth. Divide and add food coloring if desired.
11 - Apply icing to completely cooled cookies and add sprinkles. Allow icing to set completely before serving.