Preheat your oven to 350°F (175°C). This ensures your cookies bake evenly and come out perfectly golden.
In a mixing bowl, combine the softened butter and 3/4 cup of granulated sugar. Using an electric mixer, cream them together until the mixture is light and fluffy.
Beat in one large egg and 1 teaspoon of vanilla extract. Mix until well combined, ensuring everything is nicely blended.
In a separate bowl, whisk together 1 1/4 cups of all-purpose unbleached flour, 1/4 teaspoon cream of tartar, 1/4 teaspoon baking soda, and 1/4 teaspoon salt. Gradually add the dry mixture to the wet ingredients, mixing until just combined.
Fold in 2 teaspoons of orange zest to the cookie dough for a bright, citrusy flavor that complements the sweetness.
Using a cookie scoop or tablespoon, portion out the dough and roll it into balls. Roll each ball in the remaining 1/4 cup of granulated sugar, coating them evenly.
Place the sugar-coated dough balls on a baking sheet lined with parchment paper, spacing them about 2 inches apart. Bake in the preheated oven for 8-10 minutes or until the edges are lightly golden.
As soon as the cookies come out of the oven, gently press a Hershey's Kiss into the center of each cookie. The heat from the cookies will soften the chocolate, creating a deliciously gooey center.
Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely. Enjoy your delightful Sugar Cookie Blossoms with a glass of milk or your favorite beverage!