Ingredients

• 4 tablespoons unsalted butter, plus more for the pan
• 1 cup packed light brown sugar
• 1 1/2 teaspoons vanilla extract
• 1 large egg, lightly beaten
• 3/4 cup all-purpose flour
• 1/2 teaspoon salt
• 1/4 teaspoon baking powder
• 1/4 cup butterscotch chips
• 1/4 cup chopped walnuts
• 3 tablespoons strawberry jam

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Instructions

1. Preheat the oven to 350 degrees F. Line an 8-inch-square baking pan with foil, pressing it into the corners and up the sides; leave an overhang on 2 sides. Butter the foil.
2. Put 4 tablespoons butter and the brown sugar in a large microwave-safe bowl. Microwave until the butter is melted, about 1 minute. Stir in the vanilla. Let cool slightly, then stir in the egg.
3. Whisk the flour, salt and baking powder in a small bowl. Stir into the butter mixture. Stir in the butterscotch chips and nuts and spread the batter in the pan. Drop dollops of jam on top and swirl with a knife. Bake until set, 20 to 25 minutes. Let cool 15 minutes on a rack, then lift the foil and transfer the blondies to the rack to cool completely. Remove the foil and cut into bars.
4. Photograph by Con Poulos