1. In a food processor, pulse the mushrooms until finely chopped.

2. Heat olive oil in a large skillet over medium heat. Add onions and garlic, sauté until softened.

3. Add the chopped mushrooms, tomato sauce, oregano, salt, pepper, and red pepper flakes. Simmer for 20-25 minutes.

4. Cook pasta according to package instructions. Serve the mushroom Bolognese over the cooked pasta.