French Onion Stuffed Shells

Ingredients

• 5 tbsp. salted butter, plus more for the baking dish
• 2 lb. onions, thinly sliced
• 1 1/2 tsp. kosher salt, plus more for the pasta water
• 3/4 tsp. black pepper
• 1 lb. cremini mushrooms, sliced
• 1/2 c. dry white wine
• 2 tsp. chopped fresh thyme
• 2 garlic cloves, finely chopped
• 24 jumbo pasta shells (about 8 ounces)
• 1 (15-ounce) container whole-milk ricotta cheese
• 1 large egg
• 2 c. shredded gruyère cheese (about 8 ounces)
• 3/4 c. grated parmesan cheese (about 3 ounces)
• 1 c. beef broth
• 1 c. heavy cream
• 1 tbsp. balsamic vinegar
• 1/2 c. panko
• 2 tbsp. chopped fresh chives

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