1 c butter 1 c sugar 1 c brown sugar 3 eggs 2 tsp vanilla 1 tsp salt 1/2 tsp cornstarch 2 1/2 c flour 1 1/4 c mini m&ms 1 c semi sweet chocolate chips

1 Preheat the oven to 350°F. Line a 9×13 baking pan with parchment paper. Coat with nonstick spray and set aside.
2
In the bowl of your stand mixer fitted with the paddle attachment, mix the butter, granulated sugar, and brown sugar together on medium speed for 2 minutes.
3
Add in the eggs, vanilla, salt, baking powder, and cornstarch and mix until combined, scraping the sides of the bowl as necessary.
4
Turn the mixer to low and add in the flour, mixing until incorporated.
5
Stir in the M&Ms and chocolate chips until combined.
6
Spread the cookie dough into the prepared pan, if desired press additional M&Ms and chocolate chips into the top of the dough, and bake for 25 – 30 minutes until the edges are golden and the center is almost set.
7
Allow to cool in the pan completely before cutting into bars.