01 - Preheat the oven to 400°F (200°C).
02 - Place chicken breasts between sheets of parchment paper and gently pound to an even thickness of about ½ inch. Season both sides generously with salt and black pepper.
03 - Dredge each chicken breast in all-purpose flour, shaking off any excess to ensure a light, even coating.
04 - Heat olive oil in a large oven-safe skillet over medium-high heat. Sear the chicken for 2-3 minutes per side until lightly golden. Remove and set aside on a plate.
05 - In the same skillet, add the finely chopped shallot and minced garlic. Sauté until fragrant, about 1 minute.
06 - Deglaze the pan with dry white wine, scraping up any browned bits from the bottom. Stir in the crushed tomatoes, chicken broth, and dried oregano. Let the sauce simmer for 5 minutes to develop flavor.
07 - Nestle the seared chicken breasts into the simmering sauce. Top each breast with a slice of prosciutto di Parma followed by a layer of sliced Fontina cheese.
08 - Transfer the skillet to the preheated oven and bake for 10-12 minutes, or until the cheese is melted and bubbly and the chicken is cooked through to an internal temperature of 165°F.
09 - Remove from the oven, garnish with fresh basil leaves, and serve hot with extra sauce spooned over the top.