Peanut Butter Cookie Bars
Serves 12
10 mins prep
14 mins cook
30 mins total
These soft & chewy peanut butter chocolate chip cookie bars are easy to make in a 9x13 pan! Add your favorite chocolate chips and mix-ins for the ultimate crowd pleaser!
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Preheat oven to 350ºF. While preheating, be sure to read tips & tricks in post above for recipe sucess.
In a large mixing bowl, beat together ½ cup unsalted butter (i.e. 1 stick), ¾ cup light brown sugar, and ¼ cup granulated sugar on medium speed for 30-60 seconds, or until combined. Mix in ¾ cup creamy peanut butter.
Stir in the 1 large egg, 1 egg yolk, and 1 teaspoon vanilla extract, followed by the ½ teaspoon baking soda and ¼ teaspoon salt.
Add 1 ½ cups all-purpose flour and 1 tablespoon cornstarch and mix until combined.
Add ½ cup semi-sweet chocolate chips and ½ cup peanut butter chips. Mix the dough until well-combined.
Generously grease and line a light-colored metal 9x13 pan with parchment paper. Spread dough into an even layer in pan. If desired, press a few extra chocolate chips on the top for added presentation.
Bake for 14-16 minutes, or until edges are slightly golden brown. Do not overbake; it might look a little under-baked, but the residual heat from the pan will continue to bake the cookie even after you take it out of the oven.
Cool completely before cutting - this is important! If you cut while they are warm, they will crumble.
Store in an airtight container for 3-4 days or freeze up to 1 month.