Bring a large pot of salted water to a boil. Cook spaghettini until al dente. Reserve 1 cup pasta water before draining.
In a skillet, melt 1 tablespoon butter. Add panko and paprika. Toast until golden brown. Remove and set aside.
In the same skillet, melt remaining butter. Add garlic and shallot. Cook until fragrant.
Add prawns and cook 2–3 minutes per side until pink. Remove and set aside.
Pour in white wine and chicken stock. Simmer until reduced by half.
Add tomatoes, dried herbs, chili flakes, salt, and pepper. Simmer 8–10 minutes until slightly thickened.
Add drained pasta to the sauce. Toss well. Add reserved pasta water gradually until sauce coats pasta smoothly.
Return prawns to the skillet. Stir in fresh basil and lemon juice. Adjust seasoning.
Plate pasta and top with toasted breadcrumbs, Parmesan, and fresh parsley. Serve warm.