When making a casserole for a mom-to-be, the dish should be as hearty as it is rich and comforting. Being pregnant can make you hungry.

It also should include the recipient’s favorite ingredients, which in the case of my daughter-in-law, Sara, just happens to be peas. My son, meanwhile, is gluten-free, which means anything with even a speck of wheat is verboten. So when cooking for them recently, I decided to make a pea-filled, mashed potato-topped cottage pie as a happy compromise.