In a large bowl, whisk eggs, milk, orange zest and almond extract. Stir in cubed panettone. Transfer to a buttered 3-qt. baking dish. Spoon ricotta by the tablespoon over strata. Cover; refrigerate overnight. Sprinkle on almonds, brush with cream and sprinkle with sugar. Bake at 350 degrees until just set, about 1 hour.