INGREDIENTS
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Ingredients:
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3 tablespoons olive oil, divided
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1 tablespoon butter
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2 medium onions, halved, peeled, sliced thin
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4 to 5 boneless, skinless chicken breasts
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salt and ground black pepper, to taste
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8 ounces mushrooms, sliced
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1 cup picante sauce
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1 tablespoon prepared mustard
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1 tablespoon brown sugar