Whisk together flour, baking soda, and salt. Set aside.

In a large bowl using a mixer fitted with a paddle attachment, cream butter, Biscoff Spread, and brown sugar until light and fluffy, about 2 minutes.

Add egg and vanilla, followed by the dry ingredients. Beat until just combined. Cover and chill for at least 30 minutes, up to an hour.

Preheat oven to 375F.

Using a cookie scoop, shape dough into 1-inch balls and roll into the granulated sugar. Place on a large cookie sheet lined with parchment. Bake for 8 - 10 minutes. Immediately press a chocolate candy into the center of each cookie.

Allow cookies to cool on a baking sheet for 4 minutes before transferring to a wire rack to cool completely.