Prepare creamy mushroom soup and set aside.
Preheat oven to 375 degrees F.
On a lined baking sheet, place trimmed, washed, and dried green beans.
Drizzle olive oil, salt, and pepper on green beans and toss until coated evenly.
Place in the oven for 25-30 minutes or until cooked through and slightly browned.
Meanwhile, prepare the fried onions. Don't forget to add 1/2 tsp red chili powder to the grain free flour mix that the onions are fried in from What Great Grandma Ate's recipe. It will make the fried onions spicy!
Remove fried onions on a plate lined with paper towel. Set aside.
Remove green beans from the oven.
Pour entire batch of creamy mushroom soup into cast iron skillet
Dump green beans from the baking sheet into cast iron skillet.
Make sure they’re coated well with the soup.
Place in oven again for 15-20 minutes at 375 degrees F until bubbly and hot.
Remove skillet from the oven. Top with fried onions.
Serve warm and enjoy!