Prepare campfire or grill for medium heat. Cut bread crosswise in half; cut each piece lengthwise in half. Hollow out two pieces, leaving 1/2-in. shells. Cut removed bread into cubes; reserve 1-1/2 cups (save remaining cubes for another use). Spread 1 tablespoon softened butter over bread shells. Spread remaining softened butter over remaining bread halves. Set aside., In a small Dutch oven, heat 1 tablespoon butter over campfire. Add onion; cook and stir 3-4 minutes or until tender. Stir in ham and tomato; remove from pan., In a small bowl, whisk eggs and pepper. In same pan, heat remaining butter. Pour in egg mixture; cook and stir until eggs are thickened and no liquid egg remains. Stir in ham mixture, 1 cup cheese and reserved bread cubes. Spoon filling into bread shells; sprinkle with remaining cheese. Transfer to a 13x9-in. disposable foil pan; cover with foil., Place pan over campfire. Cook 8-10 minutes or until heated through and cheese is melted. Cook reserved bread halves, buttered side down, 1-2 minutes or until toasted. Cut each piece of egg bread and toast in half.