Monster Cookie Bars

Instructions

1. Step 1: Preheat your oven to 350°F (175°C) and grease a 9x13 inch baking pan or line it with parchment paper.
2. Step 2: In a large mixing bowl, cream together the softened butter, brown sugar, and granulated sugar until light and fluffy.
3. Step 3: Add the eggs, one at a time, mixing well after each addition. Then stir in the vanilla extract.
4. Step 4: In a separate bowl, whisk together the flour, baking soda, and salt.
5. Step 5: Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
6. Step 6: Fold in the rolled oats, chocolate chips, M&M's, and peanut butter chips (if using) until evenly distributed.
7. Step 7: Spread the cookie dough evenly into the prepared baking pan, smoothing the top with a spatula.
8. Step 8: Bake in the preheated oven for 25-30 minutes, or until the edges are lightly golden and a toothpick inserted in the center comes out clean.
9. Step 9: Remove from the oven and let the bars cool in the pan for about 10 minutes before transferring to a wire rack to cool completely.
10. Step 10: Once cooled, cut into squares or rectangles and enjoy!