Preheat the oven to 375°F.

Line two professional baking sheets with parchment paper.

In a small ceramic bowl, whisk together the flour, baking powder, and salt until uniform.

In a separate bowl, stir together 1/3 cup milk, 1/2 teaspoon vanilla, and 1/4 teaspoon lemon extract.

Utilizing an electric mixer, combine the softened butter and granulated sugar until the mixture is pale and fluffy, approximately 1 minute.

Incorporate the egg until fully emulsified.

With the motor on low speed, add half of the flour mixture followed by half of the flavored milk.

When combined, stir in the remaining flour and finish with the remaining liquid.

Mix only until the dough is cohesive to maintain the delicate domed structure.

Utilizing a 1.5-inch stainless steel scoop, drop the dough onto the prepared baking sheets, ensuring even spacing.

Bake for approximately 15 minutes until the cookies just begin to brown on the edges and achieve a cake-like rise.

Transfer to a wire rack and allow to cool completely before glazing.

Whisk together the confectioners’ sugar, 3 tablespoons milk, and remaining extracts until smooth and pourable.

Dip the top of each cooled cookie into the glaze.

Immediately sprinkle with yellow, purple, and green sugars to ensure the Carnival colors adhere perfectly to the fresh glaze.