Cook the spaghetti according to the package directions. Drain and set aside.
Heat the olive oil in a skillet. Add the diced onion and minced garlic and saute until golden, then add the chopped oyster mushrooms. Pour in the red wine and saute until the mushrooms are tender.
Add the chopped peeled tomatoes, basil, chili powder, salt and pepper. Cook for another 2-3 minutes.
Pour the sauce over the cooked spaghetti and mix gently.
Serve and enjoy!
Notes
Store leftovers in an airtight container in the fridge for up to 3 days. Reheat gently with a splash of water to loosen the sauce. For a gluten-free version, use gluten-free spaghetti.