In a large bowl, combine first 11 ingredients and 1 can of the tomato sauce; mix well. Stir in tomatoes. Halve zucchini lengthwise; scoop out seeds. Fill with meat mixture; place in two 13x9-in. baking dishes. Spoon remaining tomato sauce over each.
Bake, uncovered, at 375° until the zucchini is tender, about 45 minutes. Sprinkle with cheese during the last few minutes of baking.
Soft Bread Crumbs
To make soft bread crumbs, tear bread into pieces and place in a food processor or blender. Cover and pulse until crumbs form. One slice of bread yields 1/2 to 3/4 cup crumbs.
Wear disposable gloves when cutting hot peppers; the oils can burn skin. Avoid touching your face.