Preheat oven to 350°F (175°C) and line baking sheets with parchment paper.

In a large bowl, cream together softened butter, 3/4 cup sugar, and strawberry gelatin powder until light and fluffy.

Add the egg and vanilla extract, beating until well incorporated.

In a medium bowl, whisk together flour, baking soda, and salt.

Gradually mix the dry ingredients into the creamed mixture until a uniform dough forms.

Shape the dough into 1-inch balls and roll each ball in the extra granulated sugar to coat.

Place balls 2 inches apart on the prepared baking sheets.

Bake for 8 to 10 minutes until the cookies are puffed and set.

Remove from the oven and immediately press a chocolate kiss into the center of each cookie.

Allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.