Caramelized Onions, Cabrales Blue Cheese and Wild Mushroom Flatbread

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1 tablespoon unsalted butter

1 tablespoon olive oil

3 tablespoons olive oil

1 pound assorted wild mushrooms (portobello, shiitake, chanterelle, porcini)

Salt and freshly ground pepper

3 Spanish onions, sliced thinly

1 teaspoon sugar

1 ricipe flatbread

1/2 cup fresh mozzarella

1 cup crumbled blue cheese