Preheat oven to 400 degrees F (200 degrees C). Line a 13x18-inch rimmed baking sheet with foil. Coat foil with cooking spray.
Arrange chicken nuggets in a single layer on the prepared baking sheet. Bake until heated through and crispy, 13 to 15 minutes.
Adjust oven rack to the top third of the oven. Preheat broiler.
Group the baked chicken nuggets into servings of 5 nuggets each.
Combine the mozzarella and Parmesan cheeses in a bowl. Spoon 3 tablespoons marinara sauce evenly over each portion. Sprinkle with Italian seasoning and crushed red pepper. Top each portion with 1/3 cup cheese mixture.
Broil 4 to 5 inches from the heat until the cheese is melted and bubbly, 1 to 2 minutes.
Garnish with basil or parsley before serving, if desired.