Ingredients
Crust
- 1 1/2 cups Graham Crackers (1 sleeve), crushed
- 1/3 cup unsalted butter, melted
- 1/4 cup granulated sugar
Cookie Layer
- 1 cup unsalted butter, softened
- 3/4 cup granulated sugar
- 3/4 cup light brown sugar
- 2 large eggs
- 1 teaspoon vanilla extract
- 2 1/4 cups all-purpose flour
- 1 teaspoon salt
- 1 teaspoon baking soda
- 1 1/4 cup mini marshmallows
- 1 12 oz bag semi-sweet chocolate chips
Topping
- 3 Hershey Bars, broken into pieces
Instructions
- Preheat and Prepare Pan: Preheat your oven to 350º F (175º C). Line a 13×9 inch baking pan with parchment paper and set aside to ensure easy removal of the bars after baking.
- Make the Graham Cracker Crust: In a bowl, combine the crushed graham crackers, melted butter, and sugar. Press this mixture evenly into the bottom of the prepared pan. Bake for 7 minutes until it is lightly golden and firm. Let it cool slightly before adding the cookie layer.
- Cream Butter and Sugars: In an electric mixer, beat the softened butter with granulated sugar and light brown sugar at medium speed until the mixture becomes light, fluffy, and creamy, which should take about 2 minutes.
- Add Eggs and Vanilla: Beat in the eggs one at a time, then add the vanilla extract, mixing thoroughly until fully combined and smooth.
- Incorporate Dry Ingredients: Gradually mix in the all-purpose flour, salt, and baking soda into the wet ingredients until the flour just disappears. Avoid overmixing to keep the cookie texture tender.
- Fold in Chocolate and Marshmallows: Using a spatula, gently fold in the semi-sweet chocolate chips and mini marshmallows, ensuring they are evenly distributed throughout the dough.
- Spread Cookie Dough over Crust: Evenly spread the cookie dough mixture over the pre-baked graham cracker crust in the pan.
- Bake and Add Topping: Bake the bars for 15 minutes. Then, remove from the oven and immediately scatter the broken Hershey bar pieces evenly on top.
- Final Bake: Return the pan to the oven and bake for an additional 20-25 minutes, or until the cookie bars are set and golden brown on top.
- Cool and Serve: Remove from the oven and allow the cookie bars to cool completely in the pan on a wire rack before cutting into 24 pieces for serving.
Notes
- Press the graham cracker crust firmly into the pan for a sturdy base.
- Allow the bars to cool completely to ensure clean, firm cuts.
- For extra gooey marshmallows, use fresh mini marshmallows and avoid overbaking.
- Store leftover bars in an airtight container at room temperature for up to 3 days.
- Wrap and freeze for up to 1 month; thaw at room temperature before serving.
- Prep Time: 15 minutes
- Cook Time: 47 minutes
- Category: Dessert
- Method: Baking
- Cuisine: American