Bring a large pot of water to a boil and cook pasta according to the package instructions. Drain, rinse with water and set aside.
Meanwhile, season the shrimps with black pepper, garlic salt and paprika (and/or your favorite spices). Fry the shrimps for 1-2 minutes on each side.
Add sliced mushrooms, spinach, and orzo pasta and fry for few minutes, until the mushrooms are soft.
Sprinkle with feta crumbles.