Preheat oven to 350℉.
Using a large mixing bowl, cream the butter and sugar together until pale yellow and fluffy.
1 cup butter, 1 ½ cups granulated sugar
Then, add the egg and vanilla extract and whisk again.
1 large egg, 2 teaspoons vanilla extract
In a separate bowl, stir together the dry ingredients of flour and baking powder.
2 ¾ cups all purpose flour, 2 teaspoons baking powder
Slowly add the dry ingredients to the wet ingredients, mixing between each addition.
Finally, fold in the sprinkles. 1 cup sprinkles
With a spoon, scoop out some of the dough and roll into 1" to 1-½" balls. Place on a lined baking sheet.
Optionally, roll the balls of cookie dough in sugar and/or press them into a bowl full of sprinkles before placing on the baking sheet, for additional sweetness and fun!
Optional additional sugar and sprinkles for rolling cookie dough in before baking
Bake on the middle rack of the oven at 350℉ for 12 to 14 minutes.
Let cool on a wire rack for a few minutes, then enjoy!