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Adjust rack to top position and preheat oven to 450 degrees. Bring 2 TBSP butter (4 TBSP for 4 servings) to room temperature.
In a large bowl, combine marinara, cream sauce base, half the garlic powder (you’ll use the rest later), half the Italian Seasoning (all for 4), ½ tsp sugar (1 tsp for 4), and salt; stir until smooth. TIP: Cut top off cream sauce base carton to open fully; transfer contents, using a spoon or spatula to scrape sauce from carton sides.
In a small bowl, combine panko, Parmesan, a large drizzle of olive oil, salt, and pepper.