Cast Iron Ham and Cheese Quiche with Yam Crust

CAST-IRON HAM AND CHEESE QUICHE WITH YAM CRUST 1 ½-2 lbs. yams, peeled and thinly sliced ½ c. diced red onion 1 T. minced garlic Olive oil 6 eggs 1 c. shredded sharp Cheddar cheese ¾ c. half and half…