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Heat the olive oil in a large skillet over medium heat.
Add the sliced onion and cook until softened and translucent, about 5 minutes.
Add the minced garlic and crushed red pepper flakes to the skillet, and cook for an additional 1 to 2 minutes until fragrant.
Stir in the marinara sauce and bring to a simmer. Cook for 3 minutes.
Add the leftover cooked pasta to the skillet, tossing to coat with the sauce. Season with salt and black pepper.
Sprinkle with grated parmesan cheese and fresh parsley before serving.

Heat the olive oil in a large skillet over medium heat.
Add the sliced onion and cook until softened and translucent, about 5 minutes.
Add the minced garlic and crushed red pepper flakes to the skillet, and cook for an additional 1 to 2 minutes until fragrant.
Stir in the marinara sauce and bring to a simmer. Cook for 3 minutes.
Add the leftover cooked pasta to the skillet, tossing to coat with the sauce. Season with salt and black pepper.
Sprinkle with grated parmesan cheese and fresh parsley before serving.