Green Beans With Mushrooms and Caramelized Onions

Name: Green Beans With Mushrooms and Caramelized Onions
Ingredients: 3 Tbsp. olive oil, divided; 1 large sweet onion, thinly sliced (3 cups); 2 Tbsp. unsalted butter, divided; 8 oz. fresh cremini mushrooms, sliced (2 1/2 to 3 cups); 2 Tbsp. (1 oz.) brandy or dry white wine, or 1 Tbsp. beef or vegetable broth and 1 Tbsp. apple cider vinegar; 1 Tbsp. fresh thyme leaves; 1 1/2 tsp. kosher salt, divided; 1/2 tsp. freshly ground black pepper, divided; 2 lb. green beans, trimmed (10 cups); 1/4 cup beef or vegetable broth; 1/2 cup crispy fried onions or shallots