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Preheat oven to 350 degrees Fahrenheit.
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Rub the chicken breasts with seasoning salt.
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Set chicken aside.
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In a medium-large skillet cook bacon until crisp.
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Set bacon aside.
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Drain the majority of the bacon grease and cook the chicken breasts in the same skillet.
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Cook on both sides until browned.
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Meanwhile, in a small bowl combine mustard, honey, light corn syrup, mayonnaise, and dried onion flakes.
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Mix well.
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When chicken breasts are browned, place them in a 9x13 baking dish.
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Spread half of the mustard mixture on the breasts.
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Reserve the rest of the mustard mixture to serve later.
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Layer with bacon, mushrooms and cheese.
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Bake in oven for 15 minutes, or when the cheese is melted and chicken juices run clear.
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Serve with reserved mustard mixture-- enjoy!