Bring a small saucepan of water to a boil over high. Add hot dogs; reduce heat to medium-low and simmer 5 minutes. Remove from heat.
Melt butter in a small skillet over medium heat. Add onions and saute until onions are soft and have started to brown, about 5 minutes.
Drain hot dogs. Slice each into 8 rounds.
Arrange Snack Factory® Pretzel Crisps® on a serving platter. Top with about a teaspoon sauerkraut and a hot dog round. Drizzle with mustard and top with grilled onions.