You will need a mixer, and in this post I'm using a Kitchen Aid standing mixer. First, you add 1 stick of unsalted room temperature butter into the mixing bowl.
Next, you will add 1/2 cup of brown sugar (1/4 light and 1/4 dark).
Then, add 1/4 cup of granulated white sugar, 1 egg, and 2 teaspoons of vanilla extract into your mixing bowl.
Once you've combined all ingredients you will mix them together on medium speed for about 3-4 minutes or until well combined.
After these ingredients have combined, stop and scrape the sides of the mixer.
Then, add in the 1/4 cup of vanilla pudding mix(do not make the pudding mix, treat is as a dry ingredient), 1 1/4 cup of flour, 1/2 teaspoon of baking soda, and 1/4 teaspoon of salt.
On low speed mix these ingredients for about 1 minute or until well combined.
Next, we're going to add the 3/4 cup of M & M's in a cup.
Lastly, we're going to add 1/2 cup of semi-sweet chocolate chips.
Once you've combined the M &M's and the semi-sweet chocolate chips, mix on low speed for about 30 seconds.
When the dough is finished mixing be sure to scrape the dough off the paddle using a spatula.