Best Thick Soft & Chewy M&M Cookies

Preheat your oven to 325 degrees F (165 degrees C) and line the cookie sheets with parchment paper.

In a bowl, mix together the flour, baking soda, and salt.

In another large bowl, cream together the softened butter, brown sugar, and white sugar until it forms a smooth mixture.

To the butter mixture, add the vanilla extract, egg, and egg yolk one at a time, making sure to blend well after each addition.

Gradually mix in the dry ingredients until just blended.

Stir in the M&M's by hand using a wooden spoon.

For each cookie, drop 1 rounded tablespoonful of dough onto the prepared cookie sheets, ensuring there's about 3 inches space apart to allow it for spreading.

Bake the cookies in the preheated oven for 15-17 minutes, or until the edges are lightly toasted.

Allow them to cool on the baking sheets for a few minutes before transferring them to wire racks to cool completely.