Ingredients
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Cooking spray (minimal oil/non-stick)
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400g lean beef sirloin steak (or thinly sliced minute steak), visible fat removed
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1 tsp general purpose beef seasoning blend (check ingredients for added oils or sugar)
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2 large onions, thinly sliced
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1 large green bell pepper, deseeded and thinly sliced
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160g chestnut mushrooms, thinly sliced
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Topping: 4 slices of reduced-fat processed cheese or $160\text{g}$ shredded low-fat Provolone/Mozzarella
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Optional: 1-2 tbsp water or beef broth for deglazing/steaming vegetables
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Optional: Spicy chili sauce or yellow mustard for serving