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1
Preheat oven to 350 degrees. Butter the baking pan, line the pan with foil and butter the foil.
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2
For the blondies cream butter and sugar on medium speed.
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3
In a small bowl, stir together the eggs and vanilla; add the egg mixture to the butter mixture and blend on low speed until combined. Scrape down bowl.
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4
In a bowl, whisk together the flour, soda and salt. Add the flour mixture to the egg mixture and beat on low speed until just combined.
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5
Stir in the chips, then scrape the batter into the prepared pan.
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6
Bake for 20-25 minutes or until the center is not longer runny when tested with a wooden skewer.
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7
Remove the blondies to a wire rack to cool.
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8
For the topping in a small saucepan, combine the butter and milk over medium heat until the butter is melted. Add the powder sugar and brown sugar;stir until melted.
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9
Increase the heat to medium high, bring the mixture just barely to a simmer, and simmer for 5 minutes, until the mixture begins to thicken. Remove the pan from the heat.
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10
Poke holes in the top of the baked blondies with a wooden skewer, then pour the caramel topping over the top.
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11
Sprinkle the toffee pieces over the topping and let cool to set.
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12
Cut blondies into 2x3 inch pieces.
