Chocolate hazelnut blondies bake a buttery brown-sugar base with ribbons of chocolate-hazelnut spread across the top.
Use a 13 x 9 x 2 inch parchment-lined pan for twenty-four squares. The spread is dotted over the dough and swirled shallowly, then the slab cools at least ninety minutes.
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Why the Swirl Stays Near the Surface
A few shallow knife passes preserve distinct ribbons. Repeated stirring would blend the spread into the base and make plain batter harder to check.
Spreading the dough evenly to the corners avoids an unusually thick center. When testing, choose plain blondie because a pocket of spread can remain sticky after baking.
Ingredients for Chocolate Hazelnut Blondies
Base
- 1 cup unsalted butter (Melted and cooled)
- 1 cup packed light brown sugar
- 3/4 cup granulated sugar
- 2 large eggs
- 1 large egg yolk
- 1 1/2 teaspoons vanilla extract
- 2 1/2 cups all-purpose flour
- 2 teaspoons cornstarch
- 1/2 teaspoon baking powder
- 1 teaspoon salt
Swirl
- 1/2 cup generic chocolate-hazelnut spread
Eggs: Use two whole eggs plus one additional yolk.
Spread: Measure half a cup generic chocolate-hazelnut spread for the surface.
Pan: A 13 x 9 x 2 inch pan supports the stated twenty-four-square batch.
How to Make Chocolate Hazelnut Blondies
- Mix butter, sugars and eggs. Heat oven to 350°F and line the pan with parchment, leaving accessible ends for lifting. Mix melted butter with both sugars and cool until warm rather than hot before adding the two eggs, yolk and vanilla.
- Spread dough and dot topping. Whisk flour, starch, baking powder and salt in a separate bowl, then fold into the wet mixture only until no dry flour remains. Spread the thick dough evenly across the lined pan, reaching the corners without a high mound in the center. Drop the measured spread in small spoonfuls across the surface.
- Swirl and bake. Draw a knife shallowly through the upper dough a few times to create ribbons, avoiding repeated stirring or scraping the parchment. Bake about twenty-five to thirty-five minutes until edges are golden and the center is set, at least 160°F and a tester in plain blondie shows baked crumbs without liquid dough. A spread pocket may remain sticky, so check another location.
- Cool and cut. Cool on a rack at least ninety minutes, lift and cut four by six into twenty-four squares.
Serving Chocolate Hazelnut Blondies
Cut four by six after the slab has cooled. For another shallow-swirl bar, see peanut butter brownies.
Storage and Make-Ahead Notes
Keep fully cooled bars covered for up to three days at cool room temperature or refrigerate up to five days; choose refrigeration in a warm kitchen.
Freeze wrapped individual squares for one month for quality and thaw covered under refrigeration. Avoid wrapping while steam is still escaping.
Tips for Chocolate Hazelnut Blondies
- Leave lifting ends: Keep parchment accessible beyond the slab.
- Level the base: Reach corners without a central mound.
- Swirl lightly: Keep the knife in the upper dough.
- Test plain batter: A spread pocket can give a misleading sticky tester.
Chocolate Hazelnut Blondies FAQs
How many eggs are used?
Two whole eggs plus one yolk.
Is the spread mixed into all the batter?
Dot it across the surface and make a few shallow swirls.
Which pan is specified?
A 13 x 9 x 2 inch pan.
How long should it cool?
At least ninety minutes on a rack before lifting.
How many squares are cut?
Twenty-four in a four-by-six grid.
Food handling reference: FDA safe food handling guidance.
Chocolate Hazelnut Blondies with a Soft Swirled Top
Equipment
- 13 x 9 x 2 inch baking pan
- Parchment
- Mixing bowls
- Spatula
- Table knife
- Cooling rack
Ingredients
Base
- 1 cup unsalted butter Melted and cooled
- 1 cup packed light brown sugar
- 3/4 cup granulated sugar
- 2 large eggs
- 1 large egg yolk
- 1 1/2 teaspoons vanilla extract
- 2 1/2 cups all-purpose flour
- 2 teaspoons cornstarch
- 1/2 teaspoon baking powder
- 1 teaspoon salt
Swirl
- 1/2 cup generic chocolate-hazelnut spread
Instructions
- Heat oven to 350°F and line the pan with parchment, leaving accessible ends for lifting. Mix melted butter with both sugars and cool until warm rather than hot before adding the two eggs, yolk and vanilla.
- Whisk flour, starch, baking powder and salt in a separate bowl, then fold into the wet mixture only until no dry flour remains. Spread the thick dough evenly across the lined pan, reaching the corners without a high mound in the center. Drop the measured spread in small spoonfuls across the surface.
- Draw a knife shallowly through the upper dough a few times to create ribbons, avoiding repeated stirring or scraping the parchment. Bake about twenty-five to thirty-five minutes until edges are golden and the center is set, at least 160°F and a tester in plain blondie shows baked crumbs without liquid dough. A spread pocket may remain sticky, so check another location.
- Cool on a rack at least ninety minutes, lift and cut four by six into twenty-four squares.
