Absolutely Delicious Green Bean Casserole from Scratch

This green bean casserole, entirely made from scratch, combines green beans, mushrooms, and onions in a creamy homemade sauce—no canned soup required!

• Preparation Time: 15 mins
• Cooking Time: 35 mins
• Total Time: 50 mins
• Calories: 283 Calories

Ingredients

• 2 tablespoons all-purpose flour
• 1 cup sour cream
• 3 tablespoons butter
• 1 pinch ground black pepper
• 1 tablespoon chopped fresh parsley
• 1 (2.8 ounce) can French-fried onions
• 2 (12 ounce) packages frozen French cut green beans
• 8 ounces crimini mushrooms, quartered
• 1 small onion, halved and thinly sliced
• 0.5 cup milk
• 0.5 cup shredded Cheddar cheese
• 0.5 teaspoon salt
• 0.5 teaspoon lemon zest

Recipe Instructions

Step 1

Preheat the oven to 350 degrees F (175 degrees C).

Step 2

Place green beans in a saucepan and fill with about 1/2 inch water; bring to a boil. Cover and steam until beans are tender but still bright green, about 5 minutes. Drain.

Step 3

Combine drained beans in a bowl with mushrooms; toss to combine.

Step 4

Melt butter in a large skillet over medium heat. Add onion and parsley; cook and stir until onion is tender, 5 to 7 minutes. Whisk in flour until blended, then mix in lemon zest, salt, and pepper. Gradually whisk in milk, stirring constantly, so that no lumps form.

Step 5

Add sour cream and stir until combined. Warm over medium heat until sauce begins to bubble. Dump in green beans and mushrooms, stirring to coat.

Step 6

Bake in the preheated oven until Cheddar is melted, about 15 minutes.

Step 7

Remove from the heat and toss briefly with 1/2 of the Cheddar cheese and 1/2 of the French-fried onions. Spoon into a 1 ½-quart casserole dish; top with the remaining Cheddar and onions.