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5 from 2 votes

Soft Batch Monster Cookies

Soft Batch Monster Cookies are a cross between a soft peanut butter cookie and an oatmeal cookie that is loaded with peanut butter, oats, M&M's, and chocolate chips.
Prep Time15 mins
Cook Time10 mins
Chill30 mins
Total Time55 mins
Course: Dessert
Cuisine: American
Keyword: Soft Batch Monster Cookies
Servings: 24
Calories: 329kcal
Author: Amanda Rettke--iambaker.net


  • 1 cup (2 sticks / 227g) unsalted butter, room temperature
  • 1 cup (258 g) creamy peanut butter
  • cups (300 g) light brown sugar, packed
  • 2 large eggs, room temperature
  • 2 cups (250 g) all-purpose flour
  • 1 cup (90 g) old fashioned oats
  • 1 teaspoon baking soda
  • ½ teaspoon kosher salt
  • cups M&M candies
  • cups (252 g) semi-sweet chocolate chips
  • mini M&M candies, for topping (optional)


  • Line baking sheets with parchment paper. Set aside.
  • In the bowl of a stand mixer with a paddle attachment (or a handheld mixer), beat the butter on medium-high speed until smooth (about a minute).
  • Add the peanut butter; beat for about 2 minutes, or until smooth.
  • Add brown sugar and cream on medium-high speed until smooth (about 2 minutes).
  • Add eggs, one at a time, mixing for 30 seconds after each addition. Scrape down the sides of the bowl and beat ingredients together again, if necessary.
  • With the mixer off, add the flour, oats, baking soda, and salt. Mix on low until just combined, being careful not to overmix.
  • With the mixer still on low (or by hand), add the M&M's and chocolate chips and mix until incorporated. (If using an electric mixer, only mix for a few seconds.)
  • Drop spoonfuls (2-3 tablespoons) of dough onto the lined baking sheets about 2 inches apart. (If possible, measure the batter so the cookies are all the same size for best results when baking.) Top with mini m&m's (optional).
  • Place the baking sheets of unbaked cookies into the refrigerator to chill for about 30 minutes. (If letting the dough chill overnight, be sure to cover.)
  • When ready, preheat the oven to 350°F. Remove the cookies from the refrigerator.
  • Bake the cookies for 10 minutes. The cookies are done when the sides are lightly browned and the centers still look soft.
  • Remove from the oven and let cookies cool on the baking sheet for a few minutes before transferring to a wire rack to finish cooling.


Calories: 329kcal