12x18 Blondies Recipe: Easy, Chewy, and Perfectly Sweet

Blondies are a delightful variation of brownies, featuring a rich, buttery flavor with hints of vanilla and caramel. This 12×18 blondies recipe creates a large, chewy batch perfect for sharing at gatherings or satisfying a big sweet tooth. Its straightforward method and versatile ingredients make it a go-to treat for both beginner bakers and seasoned cooks alike.

Ingredients

1 cup (226 grams) unsalted butter, melted
1 1/2 cups (300 grams) packed brown sugar
2 large eggs
2 teaspoons vanilla extract
2 1/2 cups (310 grams) all-purpose flour
1 teaspoon baking powder
1/2 teaspoon salt
1 cup (175 grams) chocolate chips or chunks (optional)
1/2 cup (50 grams) chopped nuts (walnuts, pecans, optional)

Instructions

Preheat your oven to 350°F (175°C). Grease a 12×18-inch baking pan or line it with parchment paper for easy removal.
In a large mixing bowl, combine the melted butter and brown sugar. Whisk until smooth and well blended.

Add the eggs one at a time, whisking after each addition to incorporate fully. Mix in the vanilla extract.
In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add this dry mixture into the wet ingredients, stirring until just combined. Do not overmix, as this can make the blondies dense.
Fold in chocolate chips and nuts if using. Ensure even distribution throughout the batter.

Pour the batter into the prepared baking pan, spreading it evenly with a spatula to ensure a uniform thickness.
Bake for 25-30 minutes, or until a toothpick inserted into the center comes out with moist crumbs but no wet batter. Keep an eye on the edges—they should be golden brown.
Remove from oven and allow to cool in the pan for at least 20 minutes. Then, transfer to a wire rack to cool completely before slicing into 12×18 portions.

Tips

For a richer flavor, use browned butter instead of plain melted butter. Simply melt the butter and cook over medium heat until golden brown and fragrant, then cool slightly before mixing.
If you prefer a fudgier blondie, slightly underbake by a few minutes. For a firmer texture, bake a bit longer, but avoid overbaking to prevent dryness.
Customize with your favorite mix-ins like white chocolate chips, dried fruits, or coconut flakes for a personalized touch.

Store leftovers in an airtight container at room temperature for up to 3 days or refrigerate for up to a week. To keep them moist, place a piece of bread in the container.

Serving Suggestions

Serve blondies as a dessert alongside a scoop of vanilla ice cream or a drizzle of caramel sauce for extra indulgence. They also pair well with coffee or milk for a sweet afternoon treat. For a party, cut into smaller squares and arrange on a platter with fresh berries or whipped cream for an elegant presentation.

Variations

Explore different flavor profiles with these blondie variations:

Peanut Butter Blondies: Swirl in 1/2 cup of peanut butter into the batter before baking.

Marbled Blondies: Add a layer of chocolate or caramel sauce and swirl into the batter before baking for a marbled effect.
Vegan Blondies: Substitute butter with coconut oil, eggs with flaxseed eggs (1 tablespoon ground flaxseed + 3 tablespoons water per egg), and chocolate chips with dairy-free options.
Oatmeal Blondies: Incorporate 1 cup of rolled oats into the batter for added texture and fiber.

Storage and Reheating

Blondies can be stored in an airtight container at room temperature for up to 3 days. For longer storage, refrigerate for up to a week. To reheat, warm a piece in the microwave for about 10-15 seconds until soft and gooey. Alternatively, reheat in a 350°F (175°C) oven for 5-7 minutes for a fresh-baked feel. If freezing, wrap tightly in plastic wrap and foil, then store for up to 3 months. Thaw at room temperature before serving.

Frequently Asked Questions

Can I make blondies gluten-free?

Yes, substitute the all-purpose flour with a gluten-free baking blend. Be sure to check that your mix is suitable for baking and use the same amount as the regular flour.

How do I know when blondies are done?

The blondies are ready when the edges are golden brown and a toothpick inserted into the center comes out with moist crumbs. Avoid overbaking to keep them chewy and moist.

Can I add other mix-ins?

Absolutely! Nuts, dried fruits, white chocolate chips, or even shredded coconut can be added. Fold them into the batter before baking for even distribution.

What makes blondies chewy?

The high proportion of brown sugar and butter gives blondies their chewy texture. Slightly underbaking also helps retain moisture and chewiness.

Can I prepare the batter ahead of time?

Yes, you can prepare the batter a day in advance. Cover and refrigerate it until you’re ready to bake. Just give it a quick stir before pouring into the pan and baking.

Is there a way to make these vegan?

Yes, replace butter with coconut oil, eggs with flaxseed or chia seed gel, and use dairy-free chocolate chips. The texture might vary slightly, but the flavor remains delicious.

Enjoy baking these delicious blondies and sharing them with friends and family. Their rich, buttery flavor and chewy texture make them a perennial favorite that’s easy to customize and perfect for any occasion.

12×18 Blondies Recipe: Easy, Chewy, and Perfectly Sweet