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In a large skillet, cook sausage, beef, and onion over medium heat until meat is no longer pink.
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Remove from heat and drain.
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Remove centers from the tops and bottoms of each bun. Tear removed bread into small pieces and add to skillet. Set buns aside.
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Stir remaining ingredients into the sausage mixture and spoon about 1/3 cupful onto the bottom of each bun.
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Replace tops and wrap individually in heavy-duty foil.
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Place on a baking sheet and bake at 350 for 20 minutes or until heated through or freeze for up to 3 months.
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Thaw frozen sandwiches in the refrigerator and heat as directed.