Pre-heat oven to 375. Line a cookie sheet with parchment paper.
Place ¼ cup white sugar into a bowl and set aside.
Place flour, baking soda and salt in a mixing bowl and whisk together until well combined.
Place unsalted butter, white sugar and brown sugar into the bowl of an electric mixer whisk until soft and fluffy.
Add sunflower butter, egg, heavy cream or milk and vanilla extract. Mix until well combined, scrape sides if necessary.
Add flour mixture a little at a time. Add sunflower seeds and continue mixing until cookie dough is formed.
Roll about a tablespoon of cookie dough into a ball and roll in white sugar. Place on cookie sheet and flatten until cookie is about ¼ inch thick. OPTIONAL: use a brand new stamp to stamp a sunflower into the cookie. If you don’t have a stamp, create texture with a fork in a criss-cross design.
Place cookies about half inch apart on the cookie sheet and bake for about 10-12 minutes. Let cool before serving.