In the same pan, add a little more oil if needed. Sauté sliced onions and bell peppers until tender and slightly caramelized, about 5–8 minutes.
Sprinkle in turmeric, paprika, cumin, salt, and pepper, and stir for another minute to toast the spices.
Add the mushrooms and cook for another 4–5 minutes, or until the mushrooms have softened and released their moisture.