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 using an electric mixer.
03 - Mix in the egg and vanilla extract until fully incorporated into the butter mixture.
04 - Gradually add the dry ingredients to the wet mixture, mixing until a cohesive dough forms.
05 - Divide dough in half, flatten into disks, wrap separately in plastic wrap, and refrigerate for at least 30 minutes.
06 - Preheat oven to 350°F and line baking sheets with parchment paper.
07 - On a lightly floured surface, roll out one dough disk to 1/4-inch thickness.
08 - Press bunny-shaped cookie cutters into dough and place cutouts 1 inch apart on prepared baking sheets.
09 - Bake for 8-10 minutes until edges are lightly golden. Cool on baking sheets for 5 minutes, then transfer to wire racks to cool completely.
10 - Whisk powdered sugar, milk, and vanilla extract in a small bowl until smooth. Divide and add food coloring if desired.
11 - Apply icing to cooled cookies using spatulas or piping bags, then add sprinkles. Allow icing to set before serving.