Cover these cookies with any sprinkles you like. You will always get a smile.
3 cups flour
1 teaspoon baking powder
1/4 teaspoon baking soda
3/4 teaspoon fine sea or table salt
1 cup unsalted butter
1/4 cup yogurt
1 1/4 cups granulated sugar
1 large egg
2 teaspoons vanilla extract
Heat oven to 375 degrees. Line two baking large sheets with parchment paper.
Combine flour, baking powder, baking soda and salt in a bowl and whisk to blend. In a large bowl or the bowl of a stand mixer, beat yogurt, butter and sugar until fluffy. Add egg and extracts and blend again. Add flour mixture and beat just until flour disappears. In some cases, this dough will feel too soft to roll into balls in your hands; if so, let it chill in the fridge for 20 minutes or so before using.
Use a small ice cream scoop to make balls of dough and roll them briefly in the palms of your hands before dropping them in a bowl of rainbow sprinkles and gently rolling to coat them evenly.
Transfer balls of sprinkle-coated dough to baking sheets at least two inches apart. Use the palm of your hand to press down on the cookies until they are about 1/4 to 1/2-inch tall. Bake for 10 to 12 minutes until they look underbaked but lightly golden underneath. Let set on the baking sheet on a rack for a few minutes before transferring to cooling rack.