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Pre-heat oven to 400 degrees F., spray baking pan with cooking spray. Thinly slice green bell pepper and onion and set aside.
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Melt 2-3 tablespoons of butter in a large pan. saute peppers and onions until soft; drain and set aside.
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On a lightly floured surface, rollĀ the dough to a large rectangle, about 10 by 14 inches.
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Layer salami, pepperoni and ham onto the dough; then add pepper and onion mixture over top evenly. Lastly, sprinkle with shredded mozzarella; being sure to leave a 1 inch boarder around dough.
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Using a pastry brush; coat the boarder with an egg wash.Starting at the opposite long end, roll up the dough into a cylinder, pinching the edges to seal. Place on the prepared baking sheet and let the dough rise, 20 to 30 minutes.
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Brush top of Stromboli with egg wash then sprinkle with Italian seasoning and bake in preheated oven for 15-20 minutes or until golden brown.
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Let Stromboli rest 3-5 minutes; then cut into thick slices and serve with a side of warm marinara sauce.