Preheat the oven to 350°F. Line 2 cookie sheets with parchment paper.
In the bowl of a stand mixer fitted the the paddle attachment, add the butter, cane sugar, and vanilla extract. Mix on low until combined, then set a timer for 5 minutes and mix until the mixture is light in color and fluffy.
Add the egg, and mix until combined. Add the flour, and mix on low until combined into a smooth dough.
Using your hands, form the dough into 24 balls and place on the prepared cookie sheets. Press a chocolate heart into the center of each cookie.
Bake for 19 minutes, or until lightly browned on the bottom. Let cool completely on the cookie sheets.
Store in a cool dry place for up to 3 days.
Video
Notes
Tips
Always weigh ingredients for the best results.
Make sure your butter is soft. I like to leave butter out on the counter to soften naturally at room temperature, which always yields the best results! But, if you do use the microwave, only do 10 seconds at a time, even if you have to do intervals.
If you want to make these cookies year round, you can replace the chocolate hearts with just a piece of dark or milk chocolate!
Gluten Free: Replace the organic flour with 397 grams (2 ½ cups plus 1 tablespoon) gluten free flour blend.
High Altitude: Bake at 350°F for 15 minutes, or until lightly browned on the bottom.
These are shortbread cookies, so they are best kept in a cool dry place. This means just leave them out on the counter and don't put into a tupperware or airtight container as they can become soggy if you do that.