Preheat your oven to 350°F (175°C). Prepare baking sheets with parchment paper.

In a mixing bowl, cream the softened unsalted butter, granulated sugar, and brown sugar until smooth and fluffy, about 2-3 minutes.

Mix in the eggs and vanilla extract until well incorporated and smooth.

In another bowl, whisk together the flour, baking soda, and salt then gradually mix this into the wet batter until no dry spots remain.

Fold in the chocolate chips and M&M candies until evenly distributed.

Scoop rounded tablespoons of dough onto the baking sheets, spacing them about 2 inches apart.

Bake for 10-12 minutes until the edges are golden and centers are soft. Let the cookies cool on the baking sheets for about 5 minutes.

Transfer the cookies to wire racks to cool completely.