12x18 Bar Cookies Recipe for Perfectly Sized Treats

Bar cookies are a classic treat that combines ease of preparation with versatile flavors and textures. This 12×18-inch bar cookie recipe yields generous, uniform slices perfect for parties, picnics, or anytime you crave a delicious homemade dessert. Whether you’re a seasoned baker or a beginner, this recipe offers a straightforward approach to creating sweet, satisfying bars that everyone will love.

Ingredients

2 ½ cups all-purpose flour
1 teaspoon baking powder
½ teaspoon salt
1 cup unsalted butter, softened

¾ cup granulated sugar

¾ cup brown sugar, packed

2 large eggs
1 teaspoon vanilla extract
1 cup chocolate chips (semi-sweet or milk chocolate)
1 cup chopped nuts (walnuts, pecans, or almonds, optional)
1 cup fruit preserves or jam (optional, for filling)

Instructions

Preheat your oven to 350°F (175°C). Line a 12×18-inch baking sheet with parchment paper, leaving some overhang for easy removal.
In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.

In a large mixing bowl, cream the softened butter, granulated sugar, and brown sugar together using an electric mixer on medium speed until light and fluffy, about 2-3 minutes.
Add eggs one at a time, beating well after each addition. Mix in vanilla extract.
Gradually add the dry ingredients to the wet ingredients, mixing on low speed until just combined. Do not overmix.

Fold in chocolate chips and chopped nuts if using.
Spread half of the dough evenly into the prepared baking sheet, pressing down gently to create an even layer.
If using fruit preserves or jam, spread a thin layer over the first dough layer.
Carefully spread the remaining dough over the jam or directly on top if not using jam, smoothing the surface with a spatula.

Bake in the preheated oven for 20-25 minutes, or until the edges are golden brown and a toothpick inserted into the center comes out clean.
Remove from oven and allow to cool in the pan for at least 15 minutes. Then, use the parchment overhang to lift the entire sheet of bars onto a wire rack to cool completely before slicing into 12×18-inch rectangles.
Cut into squares or rectangles of your desired size, typically 2×3 inches, to serve.

Tips

For a richer flavor, substitute some of the butter with cream cheese or add a splash of almond extract.
To keep bars fresh longer, store them in an airtight container at room temperature for up to 3 days or freeze for up to 3 months.
If you prefer a crunchier top, sprinkle a little coarse sugar or additional chocolate chips on top before baking.

For gluten-free options, replace all-purpose flour with a 1:1 gluten-free baking flour blend.

Serving Suggestions

Serve these bar cookies as a sweet snack with a glass of milk or coffee. They’re perfect for dessert platters, picnics, or school lunchboxes. For a more decadent presentation, dust with powdered sugar or drizzle with melted chocolate.

Variations

Peanut Butter Bars: Add ½ cup of peanut butter to the dough for a nutty flavor.

Caramel Swirl Bars: Swirl caramel sauce into the dough before baking for a gooey center.
Oatmeal Bars: Mix in 1 cup of rolled oats for added texture and fiber.
Fruit and Nut Bars: Incorporate dried fruits like cranberries or apricots along with nuts for a fruity twist.

Storage and Reheating

Store baked bars in an airtight container at room temperature for up to 3 days for optimal freshness. For longer storage, wrap individual bars tightly in plastic wrap and freeze for up to 3 months. To reheat, microwave a single bar for 10-15 seconds or warm in a low oven at 300°F (150°C) for about 10 minutes. These methods will help retain the bars’ moistness and flavor.

Frequently Asked Questions

1. Can I make these bars ahead of time?

Yes, you can prepare the dough a day in advance and refrigerate it covered. Bake them fresh the next day for the best texture. Alternatively, baked bars can be stored and served within 3 days.

2. How do I cut the bars cleanly without crumbling?

Allow the bars to cool completely before slicing. Use a sharp serrated knife and wipe it clean between cuts for smooth, even slices. Chilling the bars slightly in the refrigerator before cutting can also help.

3. Can I customize the size of the bars?

Absolutely. The recipe is designed for a 12×18-inch sheet, which typically yields 12 large bars. Feel free to cut them smaller or larger depending on your preference or serving needs.

4. Is it necessary to line the pan with parchment paper?

While not mandatory, lining the pan with parchment makes it much easier to remove the bars without breaking them and simplifies cleanup. If you don’t have parchment, grease the pan well.

5. What are some other fillings I can use instead of jam?

You can experiment with cream cheese, caramel, fruit compotes, or even a layer of peanut butter for different flavor profiles. Just spread a thin, even layer to avoid making the bars too heavy.

6. Can I make these bars dairy-free?

Yes, substitute dairy-free margarine or coconut oil for butter, and use dairy-free chocolate chips. Ensure the other ingredients are also suitable for a dairy-free diet.

This 12×18 bar cookies recipe offers a flexible and delicious way to satisfy your sweet tooth with minimal fuss. Feel free to experiment with flavors and fillings to create your perfect bar cookies every time.

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12×18 Bar Cookies Recipe for Perfectly Sized Treats