Name: Monster Cookie Bars
Prep time: 30 min
Cook time: 22 min
Total time: 52 min
Yield: 16 portions
Cuisine: American

From the Cook

1/6

Monster Cookie Bars

atsloanestable.com

Instructions

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Instructions

Preheat the oven to 350 degrees F and line a 9" square pan with parchment paper.

In a medium bowl, whisk together the flour, cornstarch, baking powder, baking soda, and salt. Set aside.

In the bowl of a stand mixer fitted with a paddle attachment, cream together the butter and peanut butter on medium speed for 2-3 minutes.

Add the sugars and continue beating for 2-3 more minutes until light & fluffy.

Beat in the egg, egg yolk, and vanilla until fully combined.

Add the dry ingredients and mix on low speed until just combined.

Lastly, fold in the oats, Reese's pieces, and chocolate chips with a rubber spatula.

Press the dough into the pan and top with more Reese's pieces and chocolate chips.

Bake the monster cookie bars for about 22 minutes or until evenly golden. Allow to cool completely in the pan before removing.

Cut into 16 squares, top with candy eyes, and enjoy!

My Calorie Intake

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Tips & Tricks (5)

Brown Your Butter First 🧈
Toast the unsalted butter in a saucepan until golden and nutty before mixing into your dough—this adds incredible depth of flavor that elevates these bars beyond standard cookie recipes.
Chill Dough Before Baking ❄️
Refrigerate your peanut butter cookie dough for at least 30 minutes before pressing into the pan; this prevents spreading and creates chewier, thicker bars with better texture.
Press Candy Eyes at the Right Time 👀
Add candy eyes to the unbaked bars just 2-3 minutes before they finish baking so they stick firmly without melting or becoming greasy from the heat.
Distribute Mix-Ins Strategically 🎯
Reserve some Reese's pieces and chocolate chips to press directly into the dough surface after spreading—this ensures every bite has visible texture and flavor pockets.
Use Parchment and Cool Completely 📋
Line your pan with parchment paper and let bars cool completely at room temperature before cutting; this prevents crumbling and creates clean, professional-looking squares.

Intelligent Tags

Hi! I'm Sloane, welcome to Sloane’s Table! I am a Dartmouth College alumna, professional baker, recipe developer, and food photographer. Here, you will find tried & true bakery-worthy recipes ranging from simple sweets to technical pastries. Whether you are looking to challenge yourself and improve your baking skills or just want an easy, trust-worthy recipe, you're in the right place.

Recipe Facts

Diet at a Glance

Vegetarian

My Calorie Intake

Smart Nutrition

Nutrition Per Serving

Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.

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