Season the chicken breast with oregano, salt, pepper, and paprika.
In a pan, add diced onions, garlic, and sliced mushrooms, and cook until softened.
Stir in the pesto and then pour in the cream.
Add a generous handful of spinach and season again with salt and pepper.
Cook the spaghetti according to package instructions, then add it to the pan.
If desired, mix in some cheese and toss everything together.
Serve the dish on plates.
