Frosting

1. Mix together the butter and sugar using an electric mixer until well combined. It may still look pretty clumpy but just keep mixing to help loosen it up.
2. Mix in the vanilla and salt. Again, it will seem very thick and clumpy. Use a spatula to fold in the sprinkles. This is when you’ll see the frosting fully come together. 
3. Drop 11-12 heaping teaspoons onto a plate lined with parchment paper. Roll them into balls and place them in the fridge while you make the cookie dough.

Funfetti Cookies

1. Preheat the oven to 375F and line a large cookie sheet with parchment paper.
2. In a bowl, mix together the flour, baking soda, and salt. Set aside.
3. In another bowl, cream together the melted butter and sugars. Keep mixing on medium to medium-high speed until you reach a thick paste-like consistency and the mixture starts to lighten in color.
4. Next, mix in the vanilla and egg. 
5. Once combined, mix in the dry ingredients.
6. When the dough has completely come together and no dry streaks remain, fold in the sprinkles.
7. Using a 2oz cookie scoop*, fill it about halfway with the cookie dough then press a chilled frosting ball into the center. At this point, they should be firm and easy to pick up.
8. Add more cookie dough to top off the scoop and seal the frosting in. Place it on the cookie sheet.
9. Bake 5-6 cookies at a time for 8-10 minutes. The edges will turn a very light golden color and the center will still look a little soft and pale. 
10. Transfer to a cooling rack and wait about 10-15 minutes before eating. Enjoy!