Step 1 of 10
Best Ever Chocolate Chip Blondies
Preheat the oven to 350°F.
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Step 2 of 10
Best Ever Chocolate Chip Blondies
Spray an 8-inch square baking dish with nonstick cooking spray.
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Step 3 of 10
Best Ever Chocolate Chip Blondies
Combine the softened butter, brown sugar, granulated sugar, and vanilla extract in a large bowl. Beat with a hand mixer until pale and fluffy.
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Step 4 of 10
Best Ever Chocolate Chip Blondies
Add the egg to the bowl and continue to beat on medium speed until light and fluffy.
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Step 5 of 10
Best Ever Chocolate Chip Blondies
Add the flour, corn starch, baking soda, and salt to the bowl. Beat the mixture on medium speed, scraping down the sides of the bowl with a rubber spatula as needed, until the ingredients are combined.
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Step 6 of 10
Best Ever Chocolate Chip Blondies
Scrape down the sides of the bowl with a spatula, and add the chocolate chips to the mixture. Fold the chocolate chips into the dough until they are evenly distributed.
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Step 7 of 10
Best Ever Chocolate Chip Blondies
Transfer the dough to the prepared baking dish and press it into an even layer.
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Step 8 of 10
Best Ever Chocolate Chip Blondies
Bake the blondies on middle rack of oven until a toothpick inserted in the center comes out clean, about 25 minutes.
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Step 9 of 10
Best Ever Chocolate Chip Blondies
Check to see that blondies are done. Remove from oven or add time as needed.
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Step 10 of 10
Best Ever Chocolate Chip Blondies
Allow the blondies to cool at room temperature for a least 15 minutes. Refrigerate for 30 minutes to an hour, then slice and serve.