Slightly modified recipe from Epicurious
Serves 5
- 20 jumbo pasta shells (about 6 oz.)
- 1 1/2 tsp. kosher salt, divided, plus more
- 2 Tbsp. extra-virgin olive oil
- 1/2 lb. crimini or regular button mushrooms, chopped in about 1/3″ pieces
- 1 tsp. freshly ground black pepper
- 1/2 cup dry white wine or vermouth
- 6 oz. baby spinach (try using part spinach and part arugula next time
- 6 garlic cloves, thinly sliced
- 1/2 a yellow onion, small dice
- 2 Tbsp. unsalted butter
- 3 cups marinara sauce (24 oz. jar)
- 1/2 tsp. crushed red pepper flakes
- 1 tsp. Penzey’s Frozen Pizza Seasoning or Italian Seasoning (optional)
- 1 lb. whole-milk ricotta
- 3 oz. finely grated Parmesan (about 1 cup), plus more for serving
- 2 oz. mozzarella, 1/4″ dice
- 1/4 cup finely chopped fresh oregano, basil, and/or parsley (or 1 Tablespoon dried)
Highly recommended step: Place the ricotta in a cheesecloth-lined sieve and set the sieve over a bowl. Cover the ricotta with plastic wrap and place in the refrigerator for at least 8 hours or up to one day.
Cook shells in a large pot of boiling salted water, stirring occasionally, about 9 minutes (they will still be quite hard); drain. Run under cold water to stop the cooking; drain again.
Meanwhile, heat oil in a large skillet over high. Add mushrooms and cook, stirring occasionally, until they release juices, then are dry again and nicely browned, 5–6 minutes; season with black pepper and 1 tsp. salt. Reduce heat to medium, add wine, and cook, stirring, until reduced by half, 1–2 minutes. Add spinach, cover, and cook until beginning to wilt, 1–2 minutes. Uncover and continue to cook, stirring occasionally, until spinach is completely wilted and most of the liquid is evaporated, 2–4 minutes more. Transfer mushroom mixture to a large bowl; reserve skillet.
Melt butter in reserved skillet over medium-high heat, add garlic and onion and cook, stirring occasionally, until onions soften, about 5 minutes. Add marinara sauce, crushed red pepper, Pizza Seasoning or Italian Seasoning, if using, and bring to a simmer over low heat. Cook, stirring occasionally, until warmed through, 6–8 minutes.
While sauce cooks, add ricotta, 3 oz. Parmesan, mozzarella, fresh herbs, and remaining 1/2 tsp. salt to mushroom mixture and stir to combine. Spoon about 2 Tbsp. ricotta mixture into each shell. The shell should be filled to capacity but not overstuffed.
Nestle stuffed shells into hot sauce in skillet, open side up.
Cover and cook over medium heat until shells are soft and warmed through, at least 10 minutes. Remove from heat and let sit 5 minutes. Sprinkle with Parmesan and more fresh herbs as desired.