I think we can all agree, there’s something about grandma’s cooking that makes food extra-special. This green bean casserole recipe proves just that! It’s rich, creamy and the perfect dish for a new holiday tradition for any family.
Preheat oven to 375°F and spray an 8×8 baking dish with cooking spray. Preheat large skillet on medium heat and add olive oil. Add sliced onion and brown, stirring occasionally. Pour browned onions into a bowl and set aside (do not wash skillet). Spray same skillet with cooking spray, return to heat and add mushrooms. Cook until browned. Reduce heat to low; stir in flour to coat mushrooms. Slowly add milk and whisk while pouring until all lumps are gone. Add 3/4 cup water, sour cream, 1/3 cup of Parmesan cheese, salt and pepper; whisk together. Bring to a boil; reduce heat to low and let simmer until sauce thickens (about 3-4 minutes). Drain green beans and add to skillet with sauce; stir to combine. Pour mixture into prepared baking dish.
For topping, combine browned onions, breadcrumbs, remaining 1/3 cup of Parmesan cheese, olive oil and 3 tablespoons water. Mix together until crumbs appear. Top green bean mixture with topping mixture and bake, uncovered, for 25 minutes. Cover and refrigerate leftovers.
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