Brown Butter Butterscotch Toffee Blondies with Shiny Crust Step-by-step instructions

Before you start

Before starting, gather all ingredients and equipment. Line a 9x9-inch baking pan with parchment paper, leaving overhang on two opposite sides.

Preheat the oven to 350°F (175°C). Measure the flour, salt, butterscotch chips, and toffee bits so they are ready to add.

Have the eggs at room temperature for easier mixing. The brown butter can be made ahead and cooled, but it should still be warm (not hot) when mixed with the sugar to help dissolve it.

Instructions

Brown Butter and Mix Wet

1. 1Brown the Butter
   Place the butter in a medium saucepan over medium heat. Cook, stirring frequently, until the butter melts, foams, and then turns a deep amber brown with a nutty aroma, about 5 to 7 minutes. Remove from heat immediately and let cool slightly.
   Look for The butter will foam, then the milk solids will turn golden brown and smell nutty.
   Tip Watch closely to avoid burning; the butter should be deep golden, not dark brown.
2. 2Mix the Wet Ingredients
   In a large bowl, whisk the warm brown butter with the dark brown sugar until well combined. Add the eggs one at a time, whisking thoroughly after each, then stir in the vanilla extract.
   Look for The mixture should look glossy and smooth, with the sugar dissolved.
   Tip Whisk vigorously to help the sugar dissolve and create a shiny crust.
3. 3Add Dry Ingredients
   Sprinkle the flour and salt over the wet mixture. Fold gently with a rubber spatula until just combined and no streaks of flour remain.
   Look for The batter will be thick and slightly glossy.
   Tip Do not overmix; overmixing can make the blondies tough.

The butter should be deep amber with a nutty aroma, and the sugar-egg mixture should be glossy and smooth. The batter will look thick and shiny, with no lumps of sugar. This is the foundation for the shiny crust.

Fold and Pan

4. 4Fold in the Mix-ins
   Add the butterscotch morsels and crushed toffee bits to the batter. Fold gently with the spatula until evenly distributed throughout the batter.
   Look for The chips and toffee pieces should be evenly scattered through the batter.
   Tip Reserve a few chips and toffee bits to press on top before baking for a prettier finish.
5. 5Transfer to Pan
   Line a 9x9-inch baking pan with parchment paper, leaving overhang on two sides. Scrape the batter into the pan and spread it into an even layer.
   Look for The batter should be evenly spread to the edges.
   Tip Use an offset spatula or the back of a spoon to smooth the top.

The mix-ins should be evenly distributed, and the batter should be spread evenly in the pan. The top should be relatively smooth. The batter will be thick and chunky with chips and toffee.

Bake and Finish

6. 6Bake the Blondies
   Bake in a preheated 350°F (175°C) oven for 22 minutes, or until the top is shiny and golden brown and the edges are slightly crispy. The center should be just set — a toothpick inserted near the center should come out with moist crumbs, not wet batter.
   Look for The top will be shiny with a crackly crust, and the edges will be deep golden.
   Safe temperature 160°F (71°C) internal temperature (egg dishes)
   Tip Do not overbake; the center will continue to set as they cool.
7. 7Cool and Finish
   Let the blondies cool in the pan on a wire rack for at least 10 minutes. Sprinkle with Maldon sea salt flakes while still warm. Use the parchment overhang to lift the blondies out, then cut into squares.
   Look for The salt flakes will glisten on the shiny crust.
   Tip For clean cuts, use a sharp knife and wipe it between cuts.

The top should be shiny and golden with a crackly crust, and the edges should be crispy and caramelized. The kitchen will smell like brown butter and toffee. The center should be just set, and a toothpick should come out with moist crumbs.

Common mistakes

Overmixing the batter after adding the flour can develop gluten and make the blondies tough. Mix until just combined. Overbaking is another common issue — the center should look slightly underdone when you pull them out, as they will continue to set as they cool.

If the butter burns while browning, start over; burnt butter will make the blondies bitter. Finally, do not skip the salt on top — it balances the sweetness and enhances the brown butter flavor.

How to tell it’s done

The blondies are done when the top is shiny and deep golden brown, and the edges have pulled away slightly from the pan. A toothpick inserted into the center should come out with moist crumbs, not wet batter.

The internal temperature should reach 160°F (71°C) to ensure the eggs are fully cooked. If the top is browning too quickly, tent loosely with foil. Let them cool in the pan for at least 10 minutes before cutting.

• Egg dishes: 160°F (71°C) in the thickest part