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1
Combine yogurt, blue cheese, chives (if using) and dressing in a small bowl and blend with a fork to make a chunky sauce. Refrigerate it while you make the burgers; it will keep for up to 2 days.
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2
Place bulgur and 1/4 teaspoon salt in a small bowl. Pour the boiling water over, cover and set aside until the water is absorbed, about 20 minutes. Drain in a sieve, pressing out excess liquid.
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3
Meanwhile, spray a large nonstick skillet with cooking spray and turn on stove to medium heat. Add mushrooms, onion and remaining 1/2 teaspoon salt; cook, stirring, until the vegetables are softened, 8 to 10 minutes. Stir in vinegar and garlic. Immediately transfer the mixture to a plate and let cool to room temperature, about 30 minutes.
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4
Combine the vegetable mixture in a food processor; pulse briefly until coarsely chopped. Add egg; pulse briefly, scraping down the sides if necessary, until the mixture is cohesive but roughly textured. Transfer to a bowl; stir in bulgur, breadcrumbs, pecans Italian seasoning and pepper. Mix well.
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5
With dampened hands, form the mixture into eight 1/2-inch-thick patties, using about 1/2 cup for each. (I made mine into 13 mini burgers using a slider station).
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6
Place burgers on a cookie sheet (coated with cooking spray) and place under a broiler on high. Mine took 8 minutes to crisp ever so slightly and to become heated through. You can also cook them in a frying pan for 4 minutes per side (mine fell apart doing this though, that's why I put the rest of them under the broiler).
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7
Garnish the burgers with watercress and the blue cheese sauce, if desired.
