Being the peanut butter freak I am, I used peanut butter M&M’s. Also, I omitted the chocolate chips and added an extra bag of M&M’s. Yummy!
M&M Cookies
8 oz unsalted butter, cool
1 cup shortening
1 1/2 cup granulated sugar
1 cup packed light brown sugar
1 Tablespoon vanilla extract
2 large eggs
3 1/2 cups all purpose flour (spoon and sweep)
1 1/2 teaspoon salt
2 teaspoon baking soda
2 cups plain M&Ms
2/3 cup semi-sweet chocolate chips (optional)
Dough requires chilling, so don’t preheat oven.
Combine the cool butter and shortening in mixer. Beat until creamy. Add both sugars and continue beating on high for two minutes, scraping bowl. Beat in the vanilla and egg. Continue beating for another minute or until fluffy.
Stir together the flour, salt and baking soda. Add this mixture to the sugar mixture and stir until mixed. Stir in the M&Ms and chocolate chips. Chill batter for about an hour.
Preheat oven to 350 degrees F. Drop batter by rounded teaspoonfuls onto ungreased cookie sheets, spacing 3 inches apart and bake for 12-14 minutes (mine took 9 minutes on Covection Bake). Let cool on cookie sheets for about 2 minutes, then transfer to wire rack to cool.
"just a girl in the world" 
Those look SOOO good!