Homemade crispy onions are a great way to top off any dish, and they're especially good on green bean casserole. They're easy to make with just 5 ingredients and have a super crunchy texture that everyone will love!
Peel and slice the onions into thin rounds. Preheat the oven to 450 degrees Fahrenheit (220 degrees Celsius) and line 2 large baking sheets with parchment paper.
Bake in the preheated oven for 25 to 35 minutes, tossing every 10 minutes (rotating the pans in the oven as necessary) until lightly browned and crispy.