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Core and slice red and green peppers.
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In a large skillet over medium heat, add olive oil. Add onion, peppers, garlic, and crushed red pepper flakes. Sauté until peppers are tender. Remove from heat and set aside.
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Grill the Italian Sausage until cooked through. Do not poke holes in the casing while grilling as this can dry out the meat. Baste with BBQ sauce as desired. Place on deli buns, garnish with peppers and onions, and serve.