1 Tbs. butter
1 Tbs. olive oil
2 medium onions, diced
1 2/3 cups reduced-sodium chicken broth
1/2 cup heavy cream
1/2 cup all-purpose flour
1/2 tsp. salt
1/4 tsp. pepper
2 bags (24 oz. each) fresh diced potatoes
1 1/4 cups grated Gruyere cheese divided
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