Combine eggs, brown sugar, white sugar, vanilla, baking soda, butter, and peanut butter in a large bowl using a mixer.

Mix until well combined.

Add oatmeal, M&M's, and chocolate chips to the mixture.

Mix thoroughly by hand.

If the dough is too sticky, refrigerate or add more oatmeal (0.5 to 1 cup).

Scoop balls of dough onto cookie sheets, leaving space between each ball.

Bake at 350°F (175°C) for 13-15 minutes.

If using two racks, switch the positions of the top and bottom racks about halfway through baking.