Start by mixing up all the wet ingredients. Then start adding the dry ingredients... flour last.
Add the M&M's (except for 1/2 cup of them). Mix well. I highly recommend hand mixing at this point. Mixers can break up the candies.
Add drops of the cookies dough on to baking pans. Leave enough space between them as they will spread. I did not leave enough space and a few of my cookies touched. If that happens you can cut them apart after baking.
Bake at 350 degrees for about 8 minutes. Watch them carefully. You can add or subtract baking time depending on your oven. You will want the edges to just turn golden and for them to be firming up.
Allow them to cool on the baking pans up to 5 minutes. Transfer them to a cooling rack. While the cookies are still hot from the oven, press a few candies into the top of the cookie.
They freeze nicely but can become brittle and break... store in a safe flat place in your freezer.
This is a recipe that was given to me by my Grandmother... original source is unknown.