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Heat butter in skillet over medium-low heat. Add onions and cook, stirring frequently, 30-40 minutes. Once onions begin to soften and brown, sprinkle with salt and stir in stock. Cook additional 1-2 minutes and remove from heat.
Preheat oven to 425F.
Lay flatbread on baking sheet. Brush with 1 tsp. olive oil and top with caramelized onions and goat cheese. Bake 8-12 minutes, or until cheese melts and crust is crisp. Remove from oven.
Toss arugula with 1 tsp. olive oil, salt and pepper. Top flatbread with arugula and drizzle with balsamic glaze.