For the Casserole
- 1 lb fresh green beans, trimmed
- 16 ounces cremini mushrooms, sliced
- 3 cloves garlic, minced
- 4 tablespoons unsalted butter
- 2 tablespoons flour
- 1 cup chicken broth
- 1 cup heavy whipping cream
For the Pan Fried Onions
- 2 medium yellow onions, halved and thinly sliced
- 1/2 cup flour
- 1/2 teaspoon coarse salt
- 1/2 teaspoon garlic powder
- 1/4 teaspoon pepper
- 3 tablespoons panko
- 1/4 cup canola oil, for frying
- Preheat oven to 400˚F. Grease a 9X13 casserole dish.
- Blanch the green beans: Bring a large pot of 1 gallon water and 2 tablespoons coarse salt to a boil. Add the green beans and cook for 5 minutes, stirring occasionally. Drain and immediately put the green beans into a large bowl full of ice water in order to stop the cooking process. Drain completely and set aside.
- For the Casserole: In a large skillet, heat the butter over medium high heat. Add the mushrooms and a pinch of salt and cook for about 5 minutes, stirring occasionally, until the mushrooms begin to release some of their moisture.
- Add the garlic and the flour to the pan and cook for about 1 minute, stirring frequently. Pour in the chicken broth and stir, scraping up any browned bits on the bottom of the pan.
- Decrease the heat to medium low. Add the heavy whipping cream, and cook until the mixture starts to thicken, about 6-8 minutes, stirring occasionally.
- Add the blanched green beans to the pan and stir to coat. Pour the mixture into the prepared casserole dish.
- Place the dish in the oven and cook for 10 minutes, until bubbling.
- While the casserole is baking, make the pan fried onions: Mix together flour, salt, garlic powder, pepper, and panko in a large mixing bowl. Add the onions and toss to combine, evenly coating the onions in the flour mixture. In a large skillet, heat the canola oil over medium heat. Add the onions in single layer batches to the heated oil, frying until crispy and golden, about 2 minutes. Remove to a baking sheet covered in paper towels and set aside.
- Remove the casserole dish from the oven and top with freshly fried onions.
If the onions have cooled a little before the casserole was done baking, top the casserole dish with the onions and put it back in the oven for 1 to 2 minutes to warm them right back up!