This cheesy green bean casserole is an elevated version of a family-favorite Thanksgiving side dish. Made completely from scratch with fresh ingredients- it's packed with bacon, three cheeses, and crispy fried shallots on top!
Soak the shallots. Soak the sliced shallots in buttermilk for at least 10 minutes.
Prep the flour and the oil. Meanwhile, in a shallow dish, combine the flour and salt. In a large pan heat vegetable oil over medium heat to 375 F. To test if your oil is ready for frying, dip the end of a chopstick or a wooden spoon. If the oil bubbles around the handle, it's ready.
Fry the onions. Dredge the buttermilk-soaked onions in flour until well coated, shaking off any excess, and transfer to a baking sheet or plate. Fry in batches until golden brown. Remove them from the oil with a slotted spoon to a paper towel-lined plate and sprinkle with salt.
Blanch the green beans. Cut the green beans into 2-inch pieces. Blanch the green beans in a pot of boiling water for 5 minutes or until tender. Immediately transfer them to a bowl of ice water to stop them from cooking. Once cool, remove and set aside.
Cook the bacon. In a large dutch oven or pot over medium heat, cook the bacon until crispy. Transfer to a paper towel-lined plate and set aside.
Cook the veggies. Add the mushrooms, onion, and thyme to the pan and cook until the onions are translucent, about 8-10 minutes. Add the garlic and cook until fragrant, about 1 minute.
Simmer the sauce. Add the bacon back to the pan and add the flour. Cook for 1 minute. Then stir in the chicken broth, heavy cream, salt, and pepper, and simmer for 2-3 minutes, or until thickened.
Stir in the cheese. Turn the heat off and stir in the cheese a handful at a time. Toss the green beans in the sauce and pour it into your baking pan. Sprinkle with extra cheese if you want it extra cheesy!
Bake at 350 F/180 C for 20-25 minutes, until the sauce is bubbly. Top with the homemade fried onions and serve warm!
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Notes
To make ahead: After the green bean casserole is in the pan, cover the top with plastic wrap and refrigerate for up to 3 days. Leave the onions off the top to keep them from getting soggy. Bake until hot and bubbly!To freeze: Yes, we recommend only freezing it for up to 2 weeks for best results.To store: Store leftovers in the fridge in an airtight container for 4-5 days.Make a double batch to serve a crowd. You can easily double the recipe and bake it in a 9x13 baking pan or larger casserole pan to feed a crowd.Topping variations: Crushed potato chips, ritz crackers, croutons, or sliced almonds.Cheese variations: Parmesan, Swiss, cheddar, asiago, or Gruyere.