Heat the olive oil over medium-high heat in a large skillet. Add the onion and garlic and cook until softened, about 5 minutes. Add the oregano, red pepper flakes, salt, and black pepper, and cook for 1 minute more.
Add the diced tomatoes, tomato paste, and white wine to the skillet. Stir to combine, then bring to a simmer. Reduce the heat to low and simmer for 10 minutes.
Add the tortellinis to the skillet and simmer for 20 minutes, or until the tortellinis are cooked through.
Sprinkle with the Parmesan cheese and serve.
Interesting Facts
Tortellinis are a type of filled pasta from the Emilia-Romagna region of Italy.
Tortellinis are traditionally filled with a mixture of cheese, ham, and Italian herbs.
The tomato-based sauce used in this dish is known as a “sugo,” which is a classic Italian sauce.