Cook the sausage: In a large frying pan, warm 1 tablespoon of olive oil over medium heat. Add the Italian sausage and cook for about 5-7 minutes, turning occasionally, until browned on all sides. Take the sausage out of the pan and place it aside.

Sauté the vegetables: Add the second tablespoon of olive oil to the same pan. Add the sliced onions and bell peppers, and cook for about 5 minutes, stirring frequently, until the vegetables start to soften.

Add the garlic and tomatoes: Add the minced garlic to the skillet and cook for 1 minute until fragrant. Stir in the diced tomatoes with their juices and Italian seasoning. Season with salt and pepper to taste.

Return the sausage to the skillet: Slice the browned sausage into bite-sized pieces and return them to the skillet. Simmer the mixture for 10-15 minutes, stirring occasionally, until the sausage is fully cooked and the vegetables are tender.

Serve and garnish: Turn off the heat and sprinkle with fresh basil or parsley for garnish. Serve hot with crusty bread or rolls on the side for dipping, or over pasta for a more filling meal.