Boil the green beans in a pot of water about 15 minutes until tender. Drain the green beans in a colander and transfer the green beans to the baking dish.
Bring a saucepan to medium heat, then add vegetable broth, Greek yogurt, almond milk, salt, pepper and garlic powder. Stir constantly 2-3 minutes then reduce to low heat and add the corn starch. Continue stirring until the mixture thickens.
Turn off the heat and pour the mixture over green beans. Sprinkle the top with almond meal and cheese.
Bake at 350 F 10 minutes then turn the oven to broil (high). Broil another 2-3 minutes until the top slightly browned. Serve warm out of the oven!
Notes
Keep the green beans snappy and tender by blanching them in ice water after you boil them.
Stir the sauce continuously to avoid clumps.
If you double or triple the recipe, be sure to increase the size of your baking dish to ensure the casserole bakes evenly.
Store the green bean casserole in an airtight container in the refrigerator up to 5 days.