Firework Cookies

0 Preheat the oven to 350F and line two large baking sheets with parchment paper.
2 In a medium-sized bowl, whisk the flour, baking soda, baking powder, and salt. Set aside.
3 To the bowl with melted butter, add the brown sugar and sugar. Mix in with a spatula until it turns pasty, then mix egg, egg yolk, and vanilla until smooth.
4 Pour in the dry ingredients and use a rubber spatula to fold to combine. Leave a few streaks of flour; fold the sprinkles in until just dispersed.
5 Using a large cookie scoop (OR ¼ cup measuring cup) scoop the cookies onto the baking sheets and bake for 12-14 minutes. Rotate the baking sheets halfway through baking.
6 The cookies are done when the middles are JUST set and have a light golden ring around the edges. When they come out, bang the pans twice to get air out. With the inside of a fork smooth the edges to create more perfect circles if needed.
7 Let cool for 10 minutes on pan. Transfer to a cooling rack to cool for at least 15 minutes before eating.
8 Enjoy!