Ingredients
- 4 tablespoons unsalted butter, at room temperature
- 1 yellow onion, diced
- 8 ounces sliced button mushrooms
- Kosher salt and freshly ground black pepper
- 1 cup low-sodium chicken or vegetable broth
- 1 1/2 pounds green beans, trimmed and cut into bite-size pieces
- 1 cup plus 2 tablespoons grated Parmesan
- 1 cup crispy fried onions
- 2 tablespoons all-purpose flour
- 1/2 cup heavy cream
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