1/2 cup unsalted butter, melted and slightly cooled
1 cup packed light brown sugar
1 large egg, room temperature
1 teaspoon pure vanilla extract
1 cup all-purpose flour
1/2 teaspoon salt
3/4 cup chopped walnuts, toasted
1/2 cup pure maple syrup
2 tablespoons unsalted butter (for the sauce)
1/4 cup heavy cream
Vanilla bean ice cream, for serving
Whipped cream and extra walnuts for garnish
Instructions
Step 1: Preheat and Prepare Preheat your oven to 350°F (175°C). Grease an 8×8-inch square baking pan or line it with parchment paper, leaving an overhang on the sides for easy removal of the blondies.
Step 2: Mix Wet Ingredients In a large mixing bowl, whisk together the melted butter and brown sugar until smooth. Add the egg and vanilla extract, beating until the mixture is well combined and slightly glossy.
Step 3: Combine Dry Ingredients Gently fold in the flour and salt using a spatula. Be careful not to overmix, as this can make the blondies tough. Once the flour is mostly incorporated, stir in 1/2 cup of the toasted walnuts.
Step 4: Bake the Blondies Spread the batter evenly into the prepared baking pan. Bake for 20 to 25 minutes, or until the edges are golden brown and a toothpick inserted into the center comes out with a few moist crumbs. Allow them to cool in the pan for at least 15 minutes.
Step 5: Prepare the Maple Sauce In a small saucepan over medium heat, combine the maple syrup and 2 tablespoons of butter. Bring to a light simmer for 3 minutes. Remove from heat and whisk in the heavy cream until smooth and thickened. Set aside to cool slightly.
Step 6: Assemble the Sundaes Cut the warm blondies into squares. Place one square in a bowl, top with a generous scoop of vanilla ice cream, and drizzle with the warm maple sauce. Garnish with whipped cream and the remaining walnuts.