Preheat your oven to 350°F (175°C) and line a baking sheet with parchment paper or a silicone mat.

In a large mixing bowl, cream together the softened butter and granulated sugar until light and fluffy, about 3-5 minutes.

Mix in the two egg yolks and one teaspoon of vanilla extract until fully incorporated.

Gradually add all-purpose flour, mixing gently until a soft dough forms.

Scoop out portions of dough and roll them into 1-inch balls.

Roll each ball in coarse sanding sugar until evenly coated and place on the baking sheet.

Gently press a pastel candy-coated chocolate piece into the center of each dough ball.

Bake for about 8 to 10 minutes or until the bottoms are lightly golden.

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