Add minced garlic, spinach, Aleppo pepper flakes, salt, and black pepper. Stir until garlic is fragrant and spinach is wilted.
Combine cooked pasta with mushroom mixture. Add 1/4 cup reserved pasta water and sherry cooking wine. Stir in remaining butter until melted and sauce coats pasta.
Serve with a sprinkle of grated Asiago cheese and extra black pepper on top.
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Notes
Store leftovers in an airtight container in the refrigerator for 3-4 days. Reheat gently with a splash of water to restore texture.