Ingredients
Making this dish requires just a few simple ingredients. Here’s what you’ll need to prepare your string bean casserole:
- Fresh or frozen green beans: 4 cups (fresh or thawed if frozen)
- Cream of mushroom soup: 1 can (10.5 ounces), or homemade if preferred
- Milk: 1/2 cup (whole milk gives the creamiest texture)
- Onion: 1/2 medium onion, finely chopped (optional)
- Garlic powder: 1/2 teaspoon (optional for added flavor)
- Black pepper: 1/4 teaspoon
- Cheddar cheese: 1 cup, shredded (optional for a cheesy variation)
- French fried onions: 1 cup (for the crispy topping)
- Butter: 2 tablespoons (for greasing the baking dish)

