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Preheat oven to 350. Spray an 8×8 or 9×9 inch baking dish with non-stick cooking spray.
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In the bowl of a stand mixer, cream together butter and sugars.
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Add eggs and vanilla and beat until creamy.
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In a medium bowl, whisk together flour, baking powder, and salt.
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Add dry ingredients and beat until combined.
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Stir in pretzels, chocolate chips, and toffee bits.
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Spread dough into prepared baking dish. Sprinkle with coarse salt.
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Bake for 20-25 minutes or until just starting to turn golden brown.
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Cool before cutting.