Heat oven to 375ºF. Line baking sheets with parchment paper or nonstick baking mats.
In a large bowl, use an electric hand mixer to cream together butter and sugar for 2-3 minutes. Beat in the egg and vanilla. Scrape the sides of the bowl as needed and set aside. 1 cup salted butter, 1 1/2 cups granulated sugar, 1 large egg, 1 teaspoon vanilla extract
In a small bowl, whisk together flour, baking soda, and baking powder. 2 3/4 cups all-purpose flour, 1 teaspoon baking soda, 1/2 teaspoon baking powder
Gradually blend the dry ingredients into the wet ingredients. The dough will be very crumbly and floury.
Add just enough of the buttermilk to moisten the dough and make it soft, but not wet. Start with 1 tablespoon and mix well on low speed. It will most likely come together into a nice dough. If it isn't, add another 1/2 to 1 tablespoon buttermilk until it forms a dough. 3-4 tablespoons buttermilk
Roll dough into 1 inch balls and place on a parchment lined baking sheet. Dip a glass with a flat bottom in sugar, then press down gently on the dough balls to slightly flatten them. Repeat with the remaining cookie dough balls.
With a pastry brush, brush the top of each cookie lightly with the remaining buttermilk. Sprinkle with colored sugar or colorful sprinkles.
Bake cookies for 8 minutes. Take them out of the oven before they get golden brown. Let stand for 2 minutes on the baking sheets before removing cooling on a wire rack.
Video
Notes
Store in an airtight container at room temperature.
These cookies also freeze well for up to 2 months. You can also mix the cookies in the bowl of a stand mixer and use the paddle attachment.
Refer to the article above for more tips and tricks.The calories shown are based recipe making 36 cookies, with 1 serving being 1 cookie. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information. **