Heat oven to 375 degrees. Line a baking sheet with parchment paper or a silicone baking mat.
Add dry ingredients to large mixing bowl; whisk to combine.
Add wet ingredients to a medium mixing bowl; whisk to combine. Stir wet ingredients into dry ingredients. Use a large mixing spoon to fold in the M&M's.
Use a medium (2 tablespoon) cookie scoop to place balls of dough onto prepared baking sheet.
Bake at 375 for 10-12 minutes. You want the cookies light, fluffy, and slightly browned on the edges, but still a little moist in the center when coming out of the oven.
Allow cookies to cool on pan for 2-3 minutes before transferring to a wire rack to cool completely.
Notes
* You can substitute an equal amount of all-purpose or whole wheat flour for the low-carb baking mix, but the cookies will be higher in carbs and calories. - ** You can substitute an equal amount of granulated white sugar for the Erythritol, but the cookies will be higher in carbs and calories.