Heat olive oil in a large saute pan. Add garlic, chili flakes, and oregano. Cook until fragrant, about 30 seconds, while stirring constantly.
Stir in marinara sauce and cream. Season with salt and pepper. Bring to a simmer, slightly reduce heat so it is at a gently simmer, and cook for about 3-5 minutes or until thickened. Keep the pan partially covered.
Stir in Parmesan cheese. Taste for salt and pepper before serving. Makes about 2 cups.
