Mix the softened butter and sugar until creamy, add the vanilla extract and the eggs one at a time, and continue mixing until incorporated.
Combine the dry ingredients and mix until well combined. Fold the chocolate chips into the cookie dough. Form golf ball-sized cookies, and place them on a baking sheet lined with parchment paper. Place the M&M’s in different colors on each cookie and bake in a preheated oven at 190C for 8-10 minutes.
Let them cool on a wire rack.