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Preheat oven to 325 degrees.
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Open hoagie buns or French bread and sprinkle with garlic salt. Put cheese on both open surfaces of the bread. Put in the warm oven and toast until cheese is melted. Remove from the oven.
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While the bread is toasting, heat a large frying pan on the stove over medium heat. Add a little oil, then sautee the peppers, onions, and mushrooms until tender.
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Add the cream cheese and deli roast beef and stir until cream cheese is melted and distributed throughout.
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Spoon beef and vegetable mixture on top of toasted hoagie buns or bread. If using French bread, cut the bread into sandwich-sized pieces and serve.