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In a large sauté pan on medium heat, sauté onions in olive oil for 3 minutes.
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Add the mushrooms and continue cooking for 10 minutes.
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Add salt and pepper t taste and the parsley.
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Mix well.
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Cook an additional 2 minutes.
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Remove and set aside.
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In the same, still warm, pan, add the mustard and stir around.
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Add the crumbled ground beef and mix the mustard into it.
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Add the garlic and the thyme and brown the meat thoroughly, about 5 minutes.
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Drain off any rendered fat.
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Slice the loaf of French bread in half, scoop out the soft bread and set aside (or eat it unabashedly).
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Layer the meat in the bottom.
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Place the 8 slices of Swiss cheese over the meat, the spoon the mushroom/onion mixture over the top.
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Replace the top part of the loaf and wrap the entire loaf in foil.
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Bake in a 350° degree oven for 15-20 minutes or until everything is heated through.
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Remove from oven and allow to rest for 5 minutes before slicing.
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Serve and enjoy.