Preheat oven to 375°F.
Bring a large pot of salted water to a boil. Add the green beans and blanch for 3 minutes. Drain and set aside.
In a large skillet, add 1 cup of the sliced onions, the mushrooms and the mushroom broth. Sauté for 5 minutes.
Add the coconut creamer, thyme, garlic powder, parsley, salt, and pepper. Simmer for 5 minutes.
Continue to simmer for another 5 minutes until the sauce thickens slightly.
Add green beans in a 9x13-inch baking dish.
Pour the mushroom-onion mixture over the green beans.
Sprinkle the crushed chips, crispy onions or breadcrumbs evenly over the top.
Bake for 15 minutes, or until the casserole is bubbling and the crackers are lightly browned.
While the casserole is baking, heat the olive oil and remaining onions to a small skillet over medium heat. Sauté for 10-12 minutes, stirring occasionally, until the onions are caramelized and crispy.
Remove the casserole from the oven and top with the crispy onions. Serve immediately.