Mix the flour and cocoa powder very well so that the cocoa powder is mixed evenly with the flour. Make sure there are no lumps in this, if necessary, you may sift the mixture.
In another bowl, add the oil & sugar, mix very well so the sugar is dissolved.Also add the milk & vanilla extract, mix very well with the oil & sugar mixture.
Pour this prepared wet ingredients mixture to the dry flour mixture.
Stir well using a spoon until its combined evenly and there is no dry flour left in the bowl.
Add the m&m candies also to the bowl.
Knead the mixture using your hands to form the cookie dough. If any candies fall out from the dough, gently press the candies back to the dough.Transfer this prepared cookie dough to the refrigerator and chill the cookie dough for about 30 minutes.
To make the cookies
Once the cookie dough is chilled in the refrigerator for 30 minutes, its ready to be made into cookies! Preheat the oven to 350 degree Fahrenheit and layer the cookie sheet with parchment paper.Take a small amount of cookie dough in your hands and make a ball out of it. Gently press this ball and place it in the cookie sheet layered with parchment paper.
Similarly make balls out of the remaining cookie dough and press them gently to flatten out a bit (they will flatten further while baking so do not flatten a lot) and place them in the layered cookie sheet.
Keep in mind that the cookies will expand as they bake, so make sure leave enough space between each cookie. I baked these in two batches, so in the first batch I baked only 8 cookies so I places two cookies in each row leaving enough space in between the cookies. You can bake in two cookie sheets or you can also bake these in two different batches. (Keep the leftover cookie dough in the refrigerator until ready to use).
Once the cookies placed in the cookie sheet, bake in the preheated oven for 12 minutes. Once its done, immediately transfer the cookies from the hot oven so they won't get harden.
Allow the cookies to cool down completely. The cookies will look so tender while they are still hot and so they may break if you try to take them out of the cookie sheet while they are still hot. Once the cookies are cooled, they will harden and be perfect and you can easily transfer them to plates or containers.Serve the delicious chocolate m&m cookies with coffee, tea or a cup of cold milk as you prefer!