Brown the Sausage: In a 4-quart Dutch oven or a large, heavy-bottomed skillet, heat ½ tablespoon of olive oil over medium-high heat. Add the Italian sausage and cook until beautifully browned, breaking it apart into bite-sized crumbles as it cooks. Once browned, remove the sausage from the pan using a slotted spoon and set it aside. Leave the residual oils and browned bits in the pan!
Sauté the Veggies: In the same pot, heat the remaining ½ tablespoon of olive oil over medium heat. Add the sliced onion, tri-color bell peppers, and minced garlic. Sauté for about 3 minutes, stirring frequently, until the vegetables begin to soften and the garlic is fragrant.
The "Drunken" Reduction: Pour the white wine into the skillet to deglaze the pan. Scrape up any browned bits from the bottom. Allow the wine to simmer and reduce until it has almost completely evaporated.
Simmer the Sauce: Stir in the undrained diced tomatoes, dried Italian seasoning, red pepper flakes, salt, and black pepper. Bring the mixture to a gentle simmer, turn the heat down to low, and let it cook for 10 minutes so the flavors can marry.
Cook the Noodles: While the sauce simmers, bring a separate large pot of salted water to a boil. Cook the egg noodles according to the package instructions until they are al dente (tender but still have a slight bite).
Combine and Serve: Return the cooked Italian sausage to the sauce pot and sprinkle in the freshly chopped parsley. Let it cook for 5 more minutes. Drain the cooked egg noodles well, then add them directly into the pot with the sausage and peppers. Toss everything gently to combine, ensuring the noodles soak up all that wonderful flavor. Serve immediately and enjoy!