Shells with Peas and Mushrooms

Bring a large pot of salted water to a boil for pasta. In a large skillet, heat oil over medium. Add bacon and scallions and saute until scallions are wilted, about 4 minutes. Add mushrooms and sprinkle with salt. Continue to cook, stirring occasionally, until mushrooms have released their moisture, about 5 minutes.

Add stock, peas, and butter and season lightly with salt and pepper. Simmer until liquid is reduced by half, about 10 minutes. Check seasoning and adjust if necessary. Meanwhile, stir pasta into boiling water and cook, stirring occasionally, until al dente, about 12 minutes.

Drain pasta and return to pot. Add sauce and stir over low until pasta is coated. Remove from heat and add cheese. Toss well and serve.