Step 1

BOIL a large pot of salted water. Cook penne according to package directions.

Step 2

HEAT a large frying pan over medium. Add oil, then garlic, and cook until sizzling, 30 sec. Stir in rosemary until fragrant, 10 sec. Increase heat to medium-high, then add mushrooms and salt. Cook until mushrooms are browned, 3 min. Season with fresh pepper. Add green onions and cook until wilted, 2 minutes. Ladle in 1 cup pasta water and simmer until mushrooms are tender, about 10 min.

Step 3

SCOOP penne from boiling water and add directly to mushroom mixture. Stir in ricotta and parsley, adding additional pasta water if required. Cook until warmed through. Remove from heat and stir in grana padano.