Preheat oven to 375°F. In a large bowl combine soup and milk. Stir in ham, cooked rice, asparagus, fennel, cheese, and onion. Transfer ham mixture to an ungreased 2-quart square baking dish.
In a small bowl combine panko and melted butter. Sprinkle over ham mixture.
Bake, uncovered, for 40 to 45 minutes or until heated through and lightly browned. Let stand for 10 minutes before serving.
To prepare 2 cups cooked rice, in a medium saucepan combine 1-1/3 cups water and 2/3 cup uncooked long grain white rice. Bring to boiling; reduce heat. Simmer, covered, for 15 to 18 minutes or until rice is tender.