Ingredients

• 2 sticks (1 cup) unsalted butter, cut into small piece, plus more for greasing
• 2 1/4 cups all-purpose flour, plus more for dusting
• 1 1/2 cups firmly-packed light brown sugar
• 3/4 teaspoon baking soda
• 1/2 teaspoon fine salt
• 2 large eggs
• 1 teaspoon vanilla extract
• About 1 1/2 cups butterscotch, semisweet chocolate, peanut butter, or white chocolate chips, optional

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Instructions

1. Preheat oven to 375 degrees F. Butter and flour a 9-by-13-inch glass baking dish and set aside.
2. Melt butter in a medium skillet over medium heat until the water evaporates and the milk solids turn golden brown, 7 to 10 minutes. Remove from heat and let cool slightly.
3. Stir butter into brown sugar in a large bowl until smooth; cool to room temperature.
4. Meanwhile, in another medium bowl, whisk together flour, baking soda, and salt; set aside. Whisk eggs and vanilla into sugar mixture. Add flour mixture a bit at a time and mix until a smooth thick batter forms. Fold in chips, as desired.
5. Evenly spread batter into prepared dish. Bake until blondies are light brown around edges and a toothpick inserted in center comes out clean, about 20 to 25 minutes.
6. Remove from oven; cool slightly. Invert onto a rack to release; cool completely. Cut into squares and serve.