Preheat your oven to 350° and prepare your baking sheets with parchment paper or a silicone mat.

Add your room temperature butter to your mixing bowl with the white granulated sugar. Mix well.

Next add your eggs one at a time. Make sure you mix completely before adding the next egg. Now add your vanilla extract, baking powder and salt and mix well.

Add your wet mixture to a large mixing bowl with your flour and mix by hand. I find it easiest to put on a pair of gloves and mix with your hands. Once your flour is mixed in thoroughly, add your M&M's and mix well.

Take 2 tablespoons of cookie dough, roll in a ball and place on your baking sheet. Flatten just slightly. Bake for 8-10 minutes. You do not want your cookies to brown. Bake until the center is just set.