10x15 Blondies Recipe for Soft, Chewy Bars

Blondies are a delightful alternative to traditional brownies, offering a rich, buttery flavor with a tender, chewy texture. This 10×15-inch blondie recipe is perfect for feeding a crowd or ensuring you have plenty of sweet treats on hand. Simple to make and customizable, it’s a go-to dessert for any occasion.

Ingredients

1 cup (226 grams) unsalted butter, melted
1 1/2 cups (300 grams) packed light 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 (170 grams) chocolate chips or chunks (optional)

Optional Add-ins:

1/2 cup chopped nuts (walnuts, pecans, or almonds)
1/2 cup shredded coconut

Instructions

Preheat your oven to 350°F (175°C). Line a 10×15-inch (25×38 cm) baking pan with parchment paper or lightly grease it to prevent sticking.
In a large mixing bowl, combine the melted butter and light brown sugar. Whisk until smooth and well combined, ensuring the sugar dissolves slightly into the butter.

Add the eggs one at a time, mixing thoroughly after each addition. Then stir in the vanilla extract.
In a separate bowl, whisk together the all-purpose flour, baking powder, and salt. Gradually add this dry mixture to the wet ingredients, stirring just until combined. Do not overmix, as this can make the blondies tough.
Fold in the chocolate chips or chunks, along with any optional add-ins like nuts or shredded coconut, ensuring even distribution throughout the batter.

Pour the batter into the prepared baking pan, spreading it evenly with a spatula to fill all corners.
Bake in the preheated oven for 22-25 minutes. The blondies are done when the edges are golden brown, and a toothpick inserted into the center comes out with moist crumbs but not wet batter.
Remove from the oven and allow to cool in the pan for at least 15-20 minutes. Then, transfer to a wire rack or cut directly in the pan into 10 rows by 15 columns, creating 150 bars or larger pieces, depending on your preference.

Tips

Substitutions: For a dairy-free version, use melted coconut oil or vegan butter. You can also swap the chocolate chips for white chocolate or dried fruit.
Storage: Store blondies in an airtight container at room temperature for up to 3 days, or refrigerate for up to a week. For longer storage, freeze them wrapped tightly for up to 3 months.
Prevent overbaking: Start checking for doneness at the 22-minute mark. Overbaked blondies become dry and crumbly, so it’s better to slightly underbake and let them set as they cool.

Variations in oven timing: Oven performance varies; if your oven runs hot or cold, adjust baking time accordingly and keep an eye on the edges for that golden color.

Serving Suggestions

Serve blondies warm or at room temperature. They pair beautifully with a scoop of vanilla ice cream, a dollop of whipped cream, or a drizzle of caramel or chocolate sauce. For a more decadent treat, top with fresh berries or a sprinkle of sea salt.

Variations

Customize your blondies by adding different mix-ins like chopped dried fruits, peanut butter chips, or swirls of caramel or peanut butter before baking. You can also create layered blondies by adding a layer of jam or cream cheese in the middle before baking.

Storage and Reheating

Keep leftover blondies in an airtight container at room temperature for up to 3 days. To extend freshness, refrigerate for up to a week. Reheat individual servings in the microwave for 10-15 seconds to enjoy warm, gooey blondies. If refrigerated, warm in the microwave for about 20 seconds to restore softness.

Frequently Asked Questions

Can I make these blondies gluten-free?

Yes, substitute the all-purpose flour with a gluten-free baking flour blend. Be sure to check that your baking powder is gluten-free as well. The texture may vary slightly, but they should still turn out delicious.

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, as this can result in dry bars. They will firm up as they cool.

Can I double this recipe?

Absolutely. To double, simply double all ingredients and bake in a larger or multiple pans. Keep an eye on baking time, which may increase slightly, around 25-28 minutes.

What if I want softer blondies?

For softer blondies, slightly underbake them by 1-2 minutes and remove from the oven as soon as the edges are golden but the center still looks a little underdone. They will firm up as they cool but remain tender and chewy.

Can I make blondies ahead of time?

Yes, blondies are best enjoyed a day after baking when flavors meld. Store them properly, and they will stay fresh for up to 3 days. For longer storage, freeze them and thaw at room temperature before serving.

10×15 Blondies Recipe for Soft, Chewy Bars