Prepare the Delallo Gnocchi Kit according to the package instructions; set the cooked gnocchi aside.
Preheat the oven to 350°F (175°C).
Heat a large skillet over medium heat and add the olive oil until shimmering.
Add the minced garlic and cook 1–2 minutes until fragrant, taking care not to brown it.
Stir in the crushed tomatoes, salt, black pepper, and Italian seasoning and bring to a simmer.
Reduce the heat to low, stir in the grated Parmesan, then fold the cooked gnocchi into the sauce until evenly coated.
Sprinkle the shredded mozzarella evenly over the gnocchi, then arrange the pepperoni and top with the sliced whole milk mozzarella.
Transfer the skillet (or move the mixture to an oven-safe baking dish) and bake 25–30 minutes, until the cheese is melted and bubbly.
Remove from the oven, garnish with fresh basil, let rest a few minutes, then serve.