Fried Egg, Prosciutto, Frisee and Blue Cheese on Ciabatta

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3 tablespoons white wine vinegar

1 teaspoon Dijon mustard

1/4 teaspoon kosher salt, plus more for seasoning

1/4 teaspoon freshly ground black pepper, plus more for seasoning

3 tablespoons pure olive oil

1/4 pound Cabrales blue cheese, crumbled, plus 4 thin slices blue cheese

1/4 pound frisee, washed and dried

2 tablespoons butter

4 large eggs

8 slices ciabatta or Italian bread

8 thin slices prosciutto