Cook the spaghetti: Boil the spaghetti in plenty of salted water, following the cooking time suggested on the package, until al dente.
Toast the breadcrumbs: In a large nonstick pan, heat a little olive oil over medium heat and toast the breadcrumbs until golden and crispy. Set aside.
Prepare the sauce: In another large pan, heat the remaining olive oil over medium heat. Add the whole garlic cloves (which you can remove later) and lightly brown them to release their aroma.
Add anchovies: Add the oil-packed anchovy to the pan and use a wooden spoon to mash it until it dissolves completely.
Add the rest of the ingredients: Stir in the capers, Kalamata olives, and raisins, mixing everything together.
Combine pasta with sauce: Once the pasta is cooked, transfer it directly to the pan with the sauce. Toss the spaghetti over medium heat, adding a bit of pasta cooking water if necessary to create a creamy consistency.
Finish with breadcrumbs: Sprinkle the toasted breadcrumbs evenly over the pasta, stirring gently to combine.
Serve: Serve the pasta scammaro hot, finishing with a drizzle of extra virgin olive oil if desired for an extra touch of flavor.