Preheat oven to 350°F. Line a baking sheet with parchment paper. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment, beat the butter and brown sugar until light and fluffy.
¼ cup unsalted butter, 1 cup brown sugar
Add the egg, peanut butter, and vanilla and mix to combine.
1 large egg, 1 cup creamy peanut butter, 1 teaspoon pure vanilla extract
Add the oats, flour, and baking soda. Mix to combine again.
2 cups old-fashioned oats, ½ cup all-purpose flour, 1 teaspoon baking soda
Fold the M&M's and candy corn into the cookie dough with a rubber spatula.
½ cup Halloween M&M's candies, ¼ cup candy corn
Scoop 1-inch balls onto the prepared baking sheet, making sure to place them at least 2 inches apart.
Bake the cookies for 15 minutes, or just until the edges are set. Then, remove them from the pan and allow them to cool to room temperature on the pan. press the candy eyes on the cookies while they’re still warm.
Candy eyes