Heat olive oil in a large skillet over medium heat. Add chopped onion and sauté until translucent.

Add minced garlic and red pepper flakes, cooking for an additional minute.

Stir in crushed tomatoes, season with salt and pepper, and let simmer for 10 minutes.

Add the prawns to the sauce and cook until they turn pink and opaque, about 5-7 minutes.

Garnish with chopped parsley before serving.