Preheat your oven to 375°F (190°C).
Cook the spaghetti according to package instructions until al dente. Drain and set aside.
In a large skillet, heat the olive oil over medium heat. Add the minced garlic and red pepper flakes, sautéing for about 1 minute until fragrant.
Add the cooked spaghetti to the skillet, along with the marinara sauce, salt, and black pepper. Toss to combine and heat through for about 2-3 minutes.
While the spaghetti is heating, prepare the bread bowls. Cut the tops off the bread rolls and hollow out the insides, leaving about a 1/2-inch thick shell.
Place the hollowed bread bowls on a baking sheet. Fill each bowl with the spaghetti mixture, packing it in gently.
Sprinkle the shredded mozzarella and grated Parmesan cheese on top of each filled bread bowl.
Bake in the preheated oven for 10-12 minutes, or until the cheese is melted and bubbly.
Remove from the oven and let cool for a few minutes. Garnish with chopped parsley before serving.