Creating these Monster Cookies is as easy as following these simple steps:

1. Preheat Your Oven: Begin by preheating your oven to 350°F (175°C). Line cookie sheets with parchment paper for easy removal.
2. Mix Peanut Butter and Sugars: In a large mixing bowl, combine the creamy peanut butter, granulated sugar, and brown sugar. Mix until smooth and creamy.
3. Add Eggs and Vanilla: Beat in the eggs one at a time, followed by the vanilla extract, until well combined.
4. Combine Dry Ingredients: In a separate bowl, mix the baking soda, oats, and salt. Gradually incorporate this into the wet mixture, stirring until fully combined.
5. Fold in Chocolate Chips: Gently fold in the M&M’s and semi-sweet chocolate chips until evenly distributed.
6. Scoop the Dough: Use a cookie scoop or tablespoon to portion out the dough onto the prepared cookie sheets. Leave space between each scoop, as they will spread while baking.
7. Bake: Place the cookie sheets in the preheated oven, baking for 10-12 minutes or until the edges start to turn golden brown.
8. Cool: Remove the cookies from the oven and let them cool on the sheets for about 5-10 minutes before transferring them to wire racks to cool completely.

By following these steps, you’ll create a delightful batch of Monster Cookies that will disappear in no time!