If using conventional oven, preheat to 350 degrees. Brown bacon with onions, jalapenos and garlic. Drain grease and set aside.
Wash and slice potatoes 1/2-inch thick. Place in a Dutch over or deep casserole dish, alternating layers of potato and bacon mixture, finishing with potatoes on top. Season each layer to taste.
Pour soda over potatoes. Cook with coals or in a conventional oven, covered, at 350 for 20-30 minutes or until potatoes are tender.