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Instructions:
- Preheat oven to 375°F (190°C) and lightly grease a 9×13-inch baking dish.
- In a skillet over medium heat, brown the ground beef until no longer pink. Drain excess fat and set aside.
- In the same skillet, heat olive oil or butter. Sauté the diced onion and mushrooms until golden and tender, about 6–7 minutes. Add minced garlic and cook for 1 more minute.
- Return the ground beef to the skillet. Stir in the cream of mushroom soup, seasoning with salt, pepper, and thyme if using. Mix well to combine.
- Spread the green beans evenly in the bottom of the prepared baking dish.
- Pour the beef and mushroom mixture over the green beans and smooth it out into an even layer.
- Sprinkle the Swiss cheese across the top.
- Bake uncovered for 20–25 minutes, or until the cheese is melted and bubbling.
- Let the casserole rest for 5 minutes before serving.
Variations :
- Creamier Texture: Stir in ¼ cup sour cream or cream cheese with the soup mixture.
- Low-Carb Option: Replace green beans with chopped cauliflower or broccoli.
- Crunchy Topping: Add crispy fried onions or breadcrumbs on top before baking for extra texture.
- Spicy Kick: Mix in a dash of red pepper flakes or a spoonful of Dijon mustard for a punchier flavor.
Tips :
- Use freshly shredded Swiss cheese for optimal melt and flavor.
- For a deeper, more robust flavor, deglaze the skillet with a splash of beef broth before adding the soup.
- This casserole reheats well—perfect for meal prepping or enjoying leftovers the next day.
- Letting the dish rest before serving helps the layers settle and makes serving easier.