These soft sugar cookies melt in your mouth with a perfectly tender texture—softer, chewier, and even better than what you’d find at a bakery. Buttery and classic, they deliver everything you crave in a homemade sugar cookie!
Line a baking sheet with parchment paper. Set aside.
In a medium bowl, whisk together the flour, baking soda, salt, and cream of tartar. Set aside.
In a stand mixing bowl, cream the butter and sugar until light and fluffy, about 3 minutes.
Scrape down the bowl, then mix in the egg, egg yolk, heavy cream, and vanilla.
Scrape down the bowl again and mix in the flour mixture and sprinkles, if using.
Cover the top of the bowl with plastic wrap and chill it in the fridge for 30 minutes.
Once chilled, scoop the mixture into two tablespoon-sized balls, roll each between your palms, and place them on the prepared baking sheet.
Wrap the pan tightly with plastic wrap and chill the cookie dough in the fridge for at least 3-4 hours, preferably overnight for thicker centers.
When ready to bake, preheat the oven to 350°F/180°C.
Bake the cold cookies on a parchment-lined baking sheet for 8-9 minutes or until the centers look puffy and no longer wet.
Let the pan cool on a wire rack, and then enjoy!
Notes
*Measure your dry ingredients properly. This is my #1 baking tip! Do not ever scoop a measuring cup into your flour, as this always leads to using too much flour. Instead, use the spoon-level method. This means fluffing the flour first, then spooning it into your measuring cup/spoon. For the BEST results, use a kitchen scale!*Notes on butter: It's important to use cool room temperature butter (66°-68°F). Butter that is too warm, even after chilling, will spread more!Storage: Keep in an airtight container at room temperature for up to 4 days.