Chicken And Kale Casserole

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Ingredients

3/4 pound large pasta shells
2 tablespoons unsalted butter
1 large yellow onion, diced medium
3 garlic cloves, minced
2 bunches kale (1 1/2 pounds), tough stems and ribs removed, leaves coarsely chopped
2 cups shredded or chopped cooked chicken (from 1/2 rotisserie chicken)
1 container (48 ounces) ricotta
3 tablespoons finely grated lemon zest (from 2 lemons)
3/4 cup parmesan, grated (2 1/4 ounces)