Marinara Sauce

1. Heat 1 tablespoon oil in medium saucepan over medium heat until just shimmering. Add garlic, ¾ teaspoon salt, oregano, and pepper flakes; cook, stirring occasionally, until fragrant, about 30 seconds. Stir in tomatoes and sugar; increase heat to high and bring to simmer.
2. Reduce heat to medium-low and simmer until thickened, about 20 minutes. Off heat, stir in basil and remaining 1 tablespoon oil; season with salt and pepper to taste. Cover and keep warm.

Chicken

1. Sprinkle each side of each cutlet with ⅛ teaspoon salt and let stand at room temperature for 20 minutes. Combine mozzarella and fontina in bowl; set aside.
2. Adjust oven rack 4 inches from broiler element and heat broiler. Whisk egg and flour together in shallow dish or pie plate until smooth. Combine Parmesan, panko, garlic powder, oregano, and pepper in second shallow dish or pie plate. Pat chicken dry with paper towels. Working with 1 cutlet at a time, dredge cutlet in egg mixture, allowing excess to drip off. Coat all sides in Parmesan mixture, pressing gently so crumbs adhere. Transfer cutlet to large plate and repeat with remaining cutlets.
3. Heat oil in 10-inch nonstick skillet over medium-high heat until shimmering. Carefully place 2 cutlets in skillet and cook without moving them until bottoms are crispy and deep golden brown, 1½ to 2 minutes. Using tongs, carefully flip cutlets and cook on second side until deep golden brown, 1½ to 2 minutes. Transfer cutlets to paper towel–lined plate and repeat with remaining cutlets.
4. Place cutlets on rimmed baking sheet and sprinkle cheese mixture evenly over cutlets, covering as much surface area as possible. Broil until cheese is melted and beginning to brown, 2 to 4 minutes. Transfer chicken to serving platter and top each cutlet with 2 tablespoons sauce. Sprinkle with basil and serve immediately, passing remaining sauce separately.