01 -
Preheat oven to 350°F. Line two baking sheets with parchment paper.
02 -
In a medium bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
03 -
Using a hand mixer or stand mixer with paddle attachment, beat unsalted butter, granulated sugar, and brown sugar on medium speed for 1 to 2 minutes until light and fluffy.
04 -
Add the cold egg and vanilla extract to the creamed mixture. Beat until well combined, scraping the sides of the bowl as necessary.
05 -
With the mixer on low, gradually add the dry ingredients to the wet mixture. Mix until just combined.
06 -
Gently stir in M&M's and white chocolate chips with a spatula.
07 -
Scoop dough into balls, each about 1 1/2 to 2 1/2 tablespoons. Gently press the top of each dough ball into a shallow bowl of pastel sprinkles.
08 -
For thicker cookies, refrigerate the shaped dough balls for about 20 minutes prior to baking.
09 -
Place dough balls on prepared baking sheets, spacing them about 1 to 2 inches apart. Ensure dough balls are mounded higher rather than wider.
10 -
Bake in preheated oven for 8 to 11 minutes, until edges are set but centers remain slightly underbaked for a soft texture.
11 -
Place baking sheets on wire racks and allow cookies to cool completely. While warm, optionally press extra M&M's and chocolate chips onto cookie tops.