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Easy Parmesan Bacon Green Bean Casserole

Easy Parmesan Bacon Green Bean Casserole

Creamy green beans baked under a golden Parmesan, bacon, and crunchy onion topping. A cozy, upgraded take on the classic casserole.
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Prep Time: 20 minutes
Cook Time: 35 minutes
Total Time: 55 minutes
Servings: 8

Ingredients
 

Main Ingredients

  • 1.5 lb fresh green beans, trimmed ends snapped
  • 6 oz thick-cut bacon, chopped divided
  • 4 tbsp unsalted butter divided
  • 1 cup diced yellow onion
  • 8 oz sliced mushrooms
  • 1.5 tsp minced garlic
  • 3 tbsp all-purpose flour
  • 1.5 cup whole milk
  • 0.5 cup low-sodium chicken broth
  • 0.33 cup sour cream optional, adds tang
  • 1 cup finely grated Parmesan cheese divided
  • 1 cup crispy fried onions
  • 0.5 cup panko breadcrumbs
  • 0.75 tsp kosher salt
  • 0.75 tsp ground black pepper

Instructions

Preparation Steps

  • Preheat oven to 375°F. Lightly grease a 9x13-inch baking dish.
  • Cook bacon in a large skillet over medium heat until crisp, 7–9 minutes. Transfer to paper towels. Reserve 2 tablespoons drippings.
  • Blanch green beans in salted boiling water until bright and crisp-tender, 4–5 minutes. Drain, rinse cold, and pat dry.
  • Sauté onion and mushrooms in the bacon drippings with 2 tablespoons butter over medium heat until softened and lightly browned, 6–8 minutes.
  • Stir in garlic and cook until fragrant, about 30 seconds.
  • Sprinkle in flour and cook, stirring, 1 minute. Slowly whisk in milk and broth until smooth; simmer until thickened, 3–4 minutes. Whisk in 1 tablespoon butter.
  • Off heat, stir in sour cream, 3/4 cup Parmesan, half the bacon, salt, and pepper.
  • Add green beans to the skillet and toss to coat. Spread the mixture in the prepared baking dish.
  • Combine panko, fried onions, remaining 1/4 cup Parmesan, and 1 tablespoon melted butter. Sprinkle evenly over the casserole.
  • Bake until bubbly and golden on top, 20–25 minutes. Rest 5 minutes, then scatter remaining bacon over the top and serve.

Notes

Variation: Swap panko for crushed Ritz crackers, or use smoked Gouda instead of some Parmesan. Make-ahead: Assemble without the topping, cover, and refrigerate up to 24 hours; add topping just before baking and add 5–10 minutes to bake time. Leftovers keep 3 days; reheat covered at 350°F until hot.
This recipe is an original creation inspired by classic Easy Parmesan Bacon Green Bean Casserole flavors. All ingredient ratios and instructions are independently developed.