Preheat broiler. In bowl stir mustard into honey.
On four 12-inch skewers alternately thread sausage, apples, and zucchini, leaving 1/4 inch between pieces. Brush with some of the honey-mustard; reserve remaining honey-mustard. Place on rack of unheated broiler pan. Broil 4 to 5 inches from heat for 4 minutes.
Meanwhile, thread bread on four 12-inch skewers; lightly brush with olive oil. Add bread skewers to broiler; turn sausage skewers. Broil 3 minutes more or until sausage is heated through and bread is toasted, turning bread once. Serve with reserved honey-mustard. Makes 4 servings.