Step 1

Preheat the oven to 350 degrees. Line a baking sheet with parchment paper and lightly coat with non-stick cooking spray. Set aside.

Step 2

In large bowl, use a hand-held mixer to beat together the butter and sugar for 3 minutes.

Step 3

Add the eggs and vanilla and beat for 2 minutes.

Step 4

Add the flour, baking soda and salt. Beat until just combined.

Step 5

Add 1 cup of the chocolate chips and 1 cup of the M&Ms. Stir into the cookie batter using a wooden spoon.

Step 6

Spread the cookie dough as evenly as possible onto the parchment-lined baking sheet. Don't get too worried about the dough being even. It will expand and fill in the gaps during the baking process.

Step 7

Bake for 15 minutes. Remove from oven. Sprinkle over the remaining chocolate chips and M&Ms, along with the candy sprinkles. Return to over and bake for 5 more minutes.

Step 8

Remove from oven. Allow to cool, undisturbed, for 15 minutes. Carefully slide the giant cookie off of the sheet pan and onto a cooling rack to continue cooling.

Step 9

Once completely cooled, slice into large bars.