Step 1

Pour ¼ cup of the olive oil in a small saucepan and heat until warm over low heat, about 2 minutes. Only warm the oil, do not allow it to bubble or simmer. Remove from the heat and add the garlic cloves. Let sit for at least 30 minutes, stirring occasionally.

Step 2

Heat the remaining tablespoon of olive oil in a large, deep skillet or Dutch oven over medium-high. Add the mushrooms and cook for 3 minutes, until they become tender and liquid becomes visible in the pan. Add half of the spinach and cook for 2 more minutes, until wilted.

Step 3

Stir in the pasta and cook for 1 more minute. Remove from the heat and stir in the remaining spinach. It will wilt only slightly. Next, discard the garlic cloves and pour the oil over the pasta. Add the lemon zest, lemon juice, salt, and pepper. Toss all ingredients to mix well.

Step 4

Serve warm, sprinkled with Parmesan cheese.