Healthy Ham and Cheese Casserole with Apples and Sage

whole wheat penne

diced ham (I used thickly sliced Virginia ham from our deli)

medium sweet apples, cored and cut into 1/2-inch dice (I used Gala)

loosely packed fresh sage leaves, thinly sliced, dived

unsalted butter

small yellow onion, chopped

garlic

all-purpose flour

non-fat milk

half and half

salt

ground nutmeg

plain non-fat Greek yogurt

freshly grated sharp white cheddar cheese

For the Bread Crumb Topping:

Panko bread crumbs

extra virgin olive oil